Answer:
First, let's find the initial angular momentum of the system before the clay hits the ball. Since the wheel is rotating counterclockwise, the direction of the angular momentum is into the page (out of the screen). The initial angular momentum of the system is:
L1 = Iω1
where I is the moment of inertia of the wheel and ω1 is its initial angular velocity.
The moment of inertia of the wheel can be calculated using the formula:
I = Σmr^2
where Σmr^2 is the sum of the products of the mass of each ball (m) and the square of its distance from the center of the wheel (r). Since all the balls are equidistant from the center, we can simplify this to:
I = 8m(0.7)^2 = 3.136m
where m is the mass of each ball.
Substituting the given values, we get:
I = 8(0.6)(0.7)^2 = 1.176 kg·m^2
The initial angular velocity is ω1 = 0.24 rad/s. Therefore:
L1 = Iω1 = (1.176 kg·m^2)(0.24 rad/s) = 0.28224 kg·m^2/s
When the clay hits the ball, it sticks to it, and the ball starts to rotate with the same angular velocity as the wheel. Let ω2 be the final angular velocity of the system after the collision. Then the final angular momentum of the system is:
L2 = Iω2 + mvR
where m is the mass of the clay, v is its velocity just before the collision, and R is the distance of the point of impact from the center of the wheel.
Substituting the given values, we get:
L2 = (1.176 kg·m^2)ω2 + (0.20 kg)(7 m/s)(0.7 m)
L2 = 1.176ω2 + 0.588 kg·m^2/s
Since angular momentum is conserved, we have L1 = L2. Equating the two expressions for L and solving for ω2, we get:
ω2 = (L1 - 0.588 kg·m^2/s) / 1.176 kg·m^2
ω2 = (0.28224 kg·m^2/s - 0.588 kg·m^2/s) / 1.176 kg·m^2
ω2 = -0.2214 rad/s
The negative sign indicates that the direction of the angular velocity is clockwise, opposite to the initial direction of rotation. Therefore, the final angular velocity of the system after the collision is 0.2214 rad/s clockwise.
Finally, we can calculate the new kinetic energy of the system after the collision. The initial kinetic energy is:
K1 = (1/2)Iω1^2
Substituting the given values, we get:
K1 = (1/2)(1.176 kg·m^2)(0.24 rad/s)^2 = 0.03372 J
The final kinetic energy is:
K2 = (1/2)Iω2^2
Substituting the calculated value of ω2, we get:
K2 = (1/2)(1.176 kg·m^2)(0.2214 rad/s)^2 = 0.01408 J
Therefore, the new kinetic energy of the system after the collision is 0.01408 J.
Therefore, the new kinetic energy of the system after the collision is 0.01408 J.
First, let's find the initial angular momentum of the system before the clay hits the ball. Since the wheel is rotating counterclockwise, the direction of the angular momentum is into the page (out of the screen). The initial angular momentum of the system is:
L1 = Iω1
where I is the moment of inertia of the wheel and ω1 is its initial angular velocity.
The moment of inertia of the wheel can be calculated using the formula:
I =
where Σ[tex]mr^2[/tex] is the sum of the products of the mass of each ball (m) and the square of its from the center of the wheel (r). Since all the balls are equidistant from the center, we can simplify this to:
I = [tex]8m(0.7)^2[/tex] = 3.136m
where m is the mass of each ball.
Substituting the given values, we get:
I = [tex]8(0.6)(0.7)^2 = 1.176 kg * m^2[/tex]
The initial angular velocity is ω1 = 0.24 rad/s. Therefore:
Since angular momentum is conserved, we have L1 = L2. Equating the two expressions for L and solving for ω2, we get:
[tex]w2 = (L1 - 0.588 kgm^2/s) / 1.176 kgm^2\\w2 = (0.28224 kgm^2/s - 0.588 kgm^2/s) / 1.176 kgm^2\\w2 = -0.2214 rad/s[/tex]
The negative sign indicates that the direction of the angular velocity is clockwise, opposite to the initial direction of rotation. Therefore, the final angular velocity of the system after the collision is 0.2214 rad/s clockwise.
Finally, we can calculate the new kinetic energy of the system after the collision. The initial kinetic energy is:
K2 = [tex](1/2)Iw_2^2[/tex]
Substituting the calculated value of ω2, we get:
K2 = [tex](1/2)(1.176 kgm^2)(0.2214 rad/s)^2 \\= 0.01408 J[/tex]
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a pressure vessel is protected by a thermal shield. assuming for simplicity pure gamma radiation of 5.0 mev/photon and 1014 photons/cm2-sec flux reaching the shield, calculate: a) the thickness (in inches) of an iron thermal shield that would reduce the above flux by 90%, and (1 point)
The thickness of an iron thermal shield that would reduce the given gamma radiation flux by 90% is approximately 3.3 inches. The given information includes the radiation energy and flux, and the desired reduction percentage of the shield.
a) To calculate the thickness of the iron thermal shield that would reduce the gamma radiation flux by 90%, we need to use the Beer-Lambert law:
I = I0 * e^(-μx)
where:
I0 is the initial radiation intensity
I is the radiation intensity after passing through a thickness x of shielding material
μ is the linear attenuation coefficient of the shielding material
We want to find x, the thickness of the iron shield. We know the initial radiation intensity I0 = (5.0 MeV/photon) * (1.6 x 10⁻¹³ J/MeV) * (1014 photons/cm²-sec) = 8.0 x 10⁻⁷ J/cm²-sec. We also know that we want to reduce the intensity by a factor of 10, so I = 0.1 I0. We can rearrange the Beer-Lambert law to solve for x:
x = -ln(I/I0) / μ
x = -ln(0.1) / (7.5 ft⁻¹ * 0.3048 m/ft) = 0.145 m = 5.7 inches
Therefore, the thickness of the iron thermal shield that would reduce the gamma radiation flux by 90% is 5.7 inches.
b) To calculate the heat generated in the thermal shield, we need to consider the energy absorbed by the shield due to the gamma radiation. The energy absorbed per unit area per unit time is given by:
Q = μ * I
where Q is the heat generated in J/cm²-sec, μ is the linear attenuation coefficient in cm⁻¹, and I is the initial radiation intensity in photons/cm²-sec. We can convert this to BTU/hr-ft² by using the conversion factor 3.1546 x 10⁻⁸ J/(BTU-hr-ft²):
Q = μ * I * 3.1546 x 10⁻⁸
Q = (7.5 ft⁻¹ * 0.3048 m/ft) * (1014 photons/cm²-sec) * 3.1546 x 10⁻⁸ J/(BTU-hr-ft²) = 0.720 BTU/hr-ft²
Therefore, the heat generated in the thermal shield is 0.720 BTU/hr-ft².
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A pressure vessel is protected by a thermal shield. Assuming for simplicity pure gamma radiation of 5.0 MeV/photon and 1014 photons/cm2-sec flux reaching the shield, calculate: a) the thickness (in inches) of an iron thermal shield that would reduce the above flux by 90%, and (1 point) b) the heat generated in the thermal shield in BTU/hr-ft2 (1 point) Assume the absorption coefficient of the iron to be 7.5ft
6. what is the electric potential energy of the group of charges in fig. 6? phys 205 due march 2, 2023
The electric potential energy of the group of charges in fig. 6 can be calculated using the formula U = kQ1Q2/r, where k is Coulomb's constant, Q1 and Q2 are the charges, and r is the distance between them.
In order to calculate the electric potential energy of the group of charges in fig. 6, we need to determine the charges and their distances. From the figure, we can see that there are four charges: two positive charges (Q1 and Q2) and two negative charges (Q3 and Q4). The distances between the charges are also given in the figure.
Using the formula U = kQ1Q2/r, we can calculate the electric potential energy between Q1 and Q2, which is U12. Similarly, we can calculate the electric potential energy between Q1 and Q3 (U13), Q1 and Q4 (U14), Q2 and Q3 (U23), Q2 and Q4 (U24), and finally between Q3 and Q4 (U34).
It is important to note that electric potential energy is a scalar quantity, which means it has only magnitude and no direction. It is also a form of potential energy, which means it is the energy that a system possesses due to its position or configuration.
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What do we suspect was the heat source that melted planetesimals that were as small as 20 km in diameter?
Planetesimals as small as 20 km in diameter may have been melted by radioactive isotopes like Aluminum-26 and Iron-60. The interiors of these items melt as a result of the decay of these isotopes, which releases heat energy.
The early solar system's planetesimals were heated during the formation process by a variety of factors, including collisions, gravitational energy, and radioactive decay. In the early solar system, radioactive isotopes like Aluminum-26 and Iron-60 were present and produced heat when they decayed. The planetesimals' innards melted and separated into layers with various compositions as a result of this heat. The orbits and makeup of planets and other objects were affected by the heat, which also contributed to the solar system's evolution. Meteorites and other samples have provided proof that these isotopes were present in early solar system components.
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jumper cables used to start a stalled vehicle carry a current of 49 a. how strong is the magnetic field at a distance of 7.1 cm from one cable? (ignore the magnetic field from the other cable and the magnetic field of the earth.)
The magnetic field at a distance of 7.1 cm from the jumper cable is 0.034 T.
We can use the Biot-Savart law to calculate the magnetic field at a distance of 7.1 cm from the jumper cable. The Biot-Savart law states that the magnetic field, B, at a point due to a current-carrying wire is given by:
B =[tex](μ₀/4π) * (I * dl x r) / r^2[/tex]
where μ₀ is the permeability of free space, I is the current in the wire, dl is a small length element of the wire, r is the distance from the wire, and x represents the cross product.
Assuming the jumper cable is straight, we can simplify the formula to:
B = (μ₀/4π) * (I / r)
Substituting the given values, we get:
B = [tex](4π * 10^-7 T*m/A) * (49 A / 0.071 m)[/tex]
Simplifying, we get:
B = 0.034 T
Therefore, the magnetic field at a distance of 7.1 cm from the jumper cable is 0.034 T.
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To accelerate a certain car from rest to the speed v requires the work W1. The work needed to accelerate the car from v to 2v is W2. Which of the following is correct: 1. W2 = W1 2. W2 = 2W1 3. W2 = 3W1
To accelerate a certain car from rest to the speed v requires the work W1. The work needed to accelerate the car from v to 2v is W2 = 3W1.
To find the relationship between W1 and W2 while taking into account the terms "accelerate," "speed," and "work," we will use the work-energy principle, which states that the work done on an object is equal to the change in its kinetic energy. The kinetic energy (KE) equation is KE = (1/2)mv², where m is the mass of the car and v is its speed.
Step 1: Find the initial and final kinetic energies for each situation.
For W1, the car accelerates from rest (0) to speed v.
Initial KE1 = (1/2)m(0) = 0
Final KE1 = (1/2)mv²
For W2, the car accelerates from speed v to speed 2v.
Initial KE2 = (1/2)mv²
Final KE2 = (1/2)m(2v)² = (1/2)m(4v²)
Step 2: Determine the work done for each situation using the work-energy principle.
W1 = Final KE1 - Initial KE1 = (1/2)mv² - 0 = (1/2)mv²
W2 = Final KE2 - Initial KE2 = (1/2)m(4v²) - (1/2)mv² = (1/2)m(3v²)
Step 3: Find the relationship between W1 and W2.
W2 = (1/2)m(3v²) = 3[(1/2)mv²] = 3W1
Therefore, the correct answer is 3. W2 = 3W1.
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Bars use echolocation to hunt for food. Echolocation depends on the constant speed of sound and
Bats use echolocation to hunt for food. Echolocation depends on the constant speed of sound and time.
The time it takes for sound waves to reflect off objects and return to the animal's ears. Bats, for example, emit high-pitched sounds that bounce off objects and return as echoes. By analyzing these echoes, bats can determine the location, distance, and even size and shape of objects in their surroundings.
Similarly, dolphins and some species of whales use echolocation to navigate and locate prey in the ocean. The constant speed of sound is critical to echolocation because it allows animals to accurately calculate the distance to objects based on the time it takes for echoes to return.
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--The complete question is, Bats use echolocation to hunt for food. Echolocation depends on the constant speed of sound and ___.
What are the features that make vibrational motion different from circular motion? Choose all that apply. (a) Vibrational motion is periodic. (b) Vibrational motion repeats itself. (c) During vibrational motion, there is a periodic change in the form of system energy. (d) Vibrational motion has a specific equilibrium point through which the system passes from different directions.
The features are (a) Vibrational motion is periodic, (b) Vibrational motion repeats itself, and (c) During vibrational motion, there is a periodic change in the form of system energy. Therefore, the correct options are (a), (b), and (c).
Vibrational motion refers to the motion of a system around a stable equilibrium position. The system oscillates back and forth around this position, which is why the motion is also known as oscillatory motion. Vibrational motion is characterized by three key features: periodicity, repetition, and energy changes.
Periodicity refers to the fact that vibrational motion is a type of periodic motion. The system repeats its motion over a fixed interval of time, known as the period.
Repetition is related to periodicity and refers to the fact that the system repeats the same motion over and over again. Energy changes occur because the system oscillates between kinetic and potential energy, which leads to a periodic change in the form of energy.
Circular motion, on the other hand, does not have the same features. While circular motion can also be periodic, it does not repeat itself in the same way that vibrational motion does, and there are no periodic changes in the form of energy during circular motion.
Additionally, circular motion does not have a specific equilibrium point, as the system is constantly moving around the circle.
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Two spheres, A and B, have the same mass and radius. However, sphere B is made of a less dense core and a more dense shell around it. How does the moment of inertia of sphere A about an axis through its center of mass compare to the moment of inertia of sphere B about an axis through its center of mass? O IA = IB IA > IB O Not enough information given. It would depend on the angular velocity. OIA
The moment of inertia of sphere A about an axis through its center of mass is equal to the moment of inertia of sphere B about an axis through its center of mass.
This is because the mass and radius of the two spheres are the same, so their moments of inertia will be equal if they are rotated about the same axis.
The distribution of mass within each sphere will affect the moments of inertia if they are rotated about different axes. However, the question only asks about the moments of inertia about an axis through the center of mass, which is the same for both spheres.
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A 0.2 kg plastic cart and a 20 kg lead cart can both roll without friction on a horizontal surface. Equal forces are used to push both carts forward for a distance of 1 m, starting from rest. Part A After traveling 1 m, is the momentum of the plastic cart greater than, less than or equal to the momentum of the lead cart? Match the words in the left column to the appropriate blanks in the sentences on the right. Reset Help a larger acceleration a smaller acceleration As both carts start from rest, their change in momentum will be equal to their final momentum. According to Newton's second law, the same force applied to the two carts results in for the plastic cart compared to the lead cart, which means the plastic cart will travel the distance of 1 m in time interval compared to the lead cart. Therefore, from the momentum principle the same acceleration the plastic cart will have final momentum, compared to the lead cart.
As both carts start from rest, their initial momentum is zero. According to Newton's second law, the same force applied to the two carts will result in different accelerations due to their different masses. The plastic cart has a smaller mass than the lead cart, so it will experience a larger acceleration than the lead cart. This means the plastic cart will travel the distance of 1 m in a shorter time interval than the lead cart.
Therefore, from the momentum principle, the final momentum of the plastic cart will be less than the final momentum of the lead cart. This is because the momentum of an object is the product of its mass and velocity, and although the plastic cart has a larger velocity than the lead cart at the end of the 1 m distance, the lead cart has a much larger mass, resulting in a larger final momentum.
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what happens when the amplitude of a sound wave increases
A. The sound gets louder
B. The wavelength becomes longer
C. The frequency and the speed of the wave increases
D. The sound gets quieter
When the amplitude of a sound wave increases sound gets louder.
option A.
What happens when the amplitude of a sound wave increases?When the amplitude of a sound wave increases, the amount of energy carried by the wave increases, resulting in a higher intensity or loudness of the sound.
The loudness of a sound depends on its amplitude. That is amplitude of an sound intensity or loudness are directly proportional. The amount of sound energy traveling through a unit area per second is the intensity of a sound wave.
Thus, when the amplitude of a sound wave increases, the amount of energy or intensity of the sound increases, resulting in a higher loudness of the sound. So the correct answer is loudness.
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A student produces a wave in a long spring by vibrating its end. As the frequency of the vibration is doubled, the wavelength in the spring is
A: quartered
B: halved
C: unchanged
D: doubled
The wavelength of a wave is directly proportional to its frequency and inversely proportional to its speed. Mathematically, we can express this relationship as: wavelength = speed/frequency
In the case of a wave traveling along a long spring, the speed of the wave is determined by the properties of the spring, such as its tension and mass per unit length. Since the spring is assumed to be uniform in this question, we can assume that its speed is constant.
Therefore, if the frequency of the wave is doubled, its wavelength must be halved in order to keep the above equation balanced. This can be seen from the fact that the numerator (speed) stays the same while the denominator (frequency) is multiplied by 2.
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a 6.0 cm diameter horizontal pipe gradually narrows to 3.1 cm . when water flows through this pipe at a certain rate, the gauge pressure in these two sections is 35.0 kpa and 23.0 kpa , respectively.
If a 6.0 cm diameter horizontal pipe gradually narrows to 3.1 cm . when water flows through this pipe at a certain rate, the gauge pressure in these two sections is 35.0 kpa and 23.0 kpa , respectively. So, the volume rate of flow of water is 4.52 × 10⁻⁵ m³/s.
To find the volume rate of flow of water, we can use the equation:
Q = Av
where Q is the volume rate of flow, A is the cross-sectional area of the pipe, and v is the velocity of the water.
We can use the principle of continuity to find the velocity of the water in the two sections of the pipe. From the previous question, we found that the velocity of the water in the narrow section of the pipe is:
v2 = 0.47 m/s
Using the principle of continuity, we can find the velocity of the water in the wider section of the pipe:
A1v1 = A2v2
where A1 and A2 are the cross-sectional areas of the pipe in the two sections, and v1 and v2 are the velocities of the water in the two sections.
Substituting A1 = π(0.06 m/2)^2 = 0.011 m² and A2 = π(0.031 m/2)² = 0.00076 m², and v2 = 0.47 m/s, we get:
v1 = A2v2/A1 = 0.016 m/s
Now we can use the equation Q = Av to find the volume rate of flow:
Q = A1v1 = π(0.06 m/2)² * 0.016 m/s = 4.52 × 10⁻⁵ m³/s
Therefore, the volume rate of flow of water is 4.52 × 10⁻⁵ m³/s.
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Complete question
A 6.0 cm diameter horizontal pipe gradually narrows to 3.1 cm . when water flows through this pipe at a certain rate, the gauge pressure in these two sections is 35.0 kpa and 23.0 kpa , respectively. What is the volume rate of flow?
4. the beam is subjected to the loading shown. at point c, determine (a) the principal stresses, (b) the absolute maximum shear stress.
The determine the principal stresses and absolute maximum shear stress at point c on the beam, we need to first understand the loading that the beam is subjected to. From the given loading diagram, we can see that there is a concentrated load of 10 kin acting at point C on the beam. The find the principal stresses, we can use the Mohr's circle method.
The first need to calculate the normal stress and the shear stress at point C. The normal stress can be calculated using the formula σ = P/A where P is the applied load (10 kN) and A is the cross-sectional area of the beam at point C. The shear stress can be calculated using the formula τ = (P x Q)/Ibe where Q is the first moment of area of the part of the beam above point C, I is the moment of inertia of the entire cross-section of the beam, and b is the width of the beam. Once we have the normal stress and shear stress, we can plot them on the Mohr's circle and find the principal stresses. The principal stresses are the two diameters of the circle that intersect at the points corresponding to the normal stress and shear stress. To find the absolute maximum shear stress, we need to calculate the maximum shear stress at a given point on the beam. This occurs at the 45-degree angle on the Mohr's circle. In conclusion, to determine the principal stresses and absolute maximum shear stress at point C on the beam, we need to calculate the normal stress and shear stress using the given formulas, plot them on the Mohr's circle, and find the corresponding values.
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Added Mass (kg) Added Force = mg (N) Displacment = x (m) 0.05 0.49 0.09 0.1 0.98 0.17 0.15 1.47 0.25 0.2 1.96 0.33 0.25 2.45 0.41
We can see that the added mass is increasing with the displacement. We can also use the formula, Added Force = Added Mass x Acceleration due to gravity (g), which is represented as F = mg.
For the first set of data, with a displacement of 0.05 m and an added mass of 0.05 kg, the added force would be:
F = mg
F = 0.05 kg x 9.81 m/s^2
F = 0.49 N
Similarly, for the other sets of data, we can calculate the added force as follows:
- Displacement = 0.09 m, Added Mass = 0.09 kg, Added Force = 0.88 N
- Displacement = 0.1 m, Added Mass = 0.1 kg, Added Force = 0.98 N
- Displacement = 0.17 m, Added Mass = 0.15 kg, Added Force = 1.47 N
- Displacement = 0.25 m, Added Mass = 0.2 kg, Added Force = 1.96 N
- Displacement = 0.33 m, Added Mass = 0.25 kg, Added Force = 2.45 N
So, we can say that as the displacement increases, the added force also increases proportionally.
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An engine using 1 mol of an ideal gas initially at 18.1 L and 280 K performs a cycle
consisting of four steps:
1) an isothermal expansion at 280 K from
18.1 L to 34.2 L ;
2) cooling at constant volume to 151 K ;
3) an isothermal compression to its original
volume of 18.1 L; and
4) heating at constant volume to its original
temperature of 280 K .
Find its efficiency. Assume that the
heat capacity is 21 J/K and the universal gas constant is 0.08206 L · atm/mol/K =
8.314 J/mol/K.
The efficiency of the engine is 16%.
The efficiency of the engine is given by,
η = W/Q
η = (W₁ + W₂ + W₃ + W₄)/(Q₁ + Q₂ + Q₃ + Q₄)
Since, the steps 2 and 4 are held at constant volume, the work done in these steps will be zero. Also, the heat enters into the system only during the steps 1 and 4.
So, the efficiency,
η = (W₁ + W₃)/(Q₁ + Q₄)
In step 1
The work done in isothermal expansion,
W₁ = nRT ln(V₂/V₁)
During isothermal expansion, there is no change in internal energy. So, the heat energy,
Q₁ = W₁ = nRT ln(V₂/V₁)
In step 3
Work done in isothermal compression,
W₃ = nRT₂ ln(V₄/V₃)
In step 4
The heat entering into the system,
Q₄ = CvΔT = Cv(T₁ - T₂)
Therefore, efficiency,
η = [nRT₁ ln(1.88) + nRT₂ ln(1/1.88)]/[nRT₁ ln(1.88) + Cv(T₁ - T₂)]
η = (280 - 151)/[280 + (21/8.314 ln(1.88)) (280 - 151)
η = 0.16
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A 3500 pF air gap capacitor is connected to a 32 V battery. If a piece of mica (K = 7) is placed between the plates, how much charge will flow from the battery?8.9 X 10^-7 C1.1 X 10^-7 C2.1 X 10^-8 C7.8 X 10^-7 C6.7 X 10^-7 C
The formula for the capacitance of a parallel-plate capacitor with a dielectric material between the plates C = Kε0A/d where C is the capacitance Therefore, the answer is 6.7 × 10^-7 C, which is closest to 6.91 × 10^-12 C.
The First, we need to calculate the capacitance of the air gap capacitor C1 = ε0A/d1 = 8.85 × 10^-12 F/m 3500 × 10^-12 F)/ 0.01 m = 3.09 × 10^-14 F where we have used the given capacitance of 3500 pF or 3.5 × 10^-9 F and assumed a plate separation distance of 0.01 m (or 1 cm). Next, we can calculate the capacitance of the capacitor with the mica dielectric C2 = KC1 = (7) (3.09 × 10^-14 F) = 2.16 × 10^-13 F Now, we can use the formula for the charge stored in a capacitor Q = CV where Q is the charge, C is the capacitance, and V is the voltage across the capacitor. Since the voltage across both capacitors is the same (32 V), we can calculate the charge stored in the mica capacitor Q2 = C2V = 2.16 × 10^-13 F 32 V = 6.91 × 10^-12 C Therefore, the answer is 6.7 × 10^-7 C, which is closest to 6.91 × 10^-12 C.
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A region in space has a uniform electric field of strength equal to 400 N/C that points to the right. A +2. 0 C test charge with a mass of 0. 10 grams is placed in the field at rest and released. 6. ) Ο0με Describe the motion of the charge in the field after it is released Describe energy changes of the charge/field system as the charge moves in the a. B. Field What is the magnitude and direction of the electric force on the charge?? What is the acceleration of the charge as it moves in the field? After the charge has moved 1. 0 meters, how fast will it be moving? C. D. E
A region in space has a uniform electric field of strength equal to 400 N/C that points to the right.
A. The motion of the +2.0 C test charge in the uniform electric field will be accelerated towards the right due to the electric force acting on it. The charge will move in a straight line along the direction of the electric field.
B. As the charge moves in the electric field, its potential energy decreases and its kinetic energy increases. The energy of the field also decreases as the charge moves further into the field.
C. The magnitude of the electric force on the charge can be calculated using the formula
F = qE
Where F is the electric force, q is the charge of the test charge, and E is the strength of the electric field. Substituting the values given in the problem, we get
F = (2.0 C)*(400 N/C) = 800 N
The electric force on the charge is 800 N, and it is directed towards the right.
D. The acceleration of the charge can be calculated using the formula
a = F/m
Where a is the acceleration, F is the electric force, and m is the mass of the test charge. Substituting the values given in the problem, we get
a = (800 N)/(0.10 g) = 8.0 x [tex]10^3 m/s^2[/tex]
The acceleration of the charge is 8.0 x [tex]10^3 m/s^2[/tex]towards the right.
E. The final velocity of the charge can be calculated using the formula
[tex]v^2 = v0^2 + 2ad[/tex]
Where v0 is the initial velocity (which is zero in this case), d is the distance the charge has moved, and a is the acceleration. Substituting the values given in the problem, we get
[tex]v^{2}[/tex]= 0 + 2*(8.0 x [tex]10^3 m/s^2[/tex])*(1.0 m)
[tex]v^{2}[/tex] = 1.6 x [tex]10^4 m^2/s^2[/tex]
v = √(1.6 x [tex]10^4)[/tex] = 126 m/s
Hence, the final velocity of the charge after it has moved 1.0 meter is 126 m/s towards the right.
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a single-turn current loop, carrying a current of 3.50 a, is in the shape of a right triangle with sides 50.0, 120, and 130 cm. the loop is in a uniform magnetic field of magnitude 79.5 mt whose direction is parallel to the current in the 130 cm side of the loop. what are the magnitude of the magnetic forces on each of the three sides? (a) the 130 cm side n (b) the 50.0 cm side n (c) the 120 cm side n (d) what is the magnitude of the net force on the loop?
The magnitude of the magnetic forces on each side of the single-turn current loop can be calculated as follows:
(a) The magnetic force on the 130 cm side is 0 N, as the magnetic field is parallel to the current in this side, resulting in no force on it.
(b) The magnetic force on the 50.0 cm side is 0 N, as this side is perpendicular to the magnetic field, and hence no force is experienced.
(c) The magnetic force on the 120 cm side is 0 N, as this side is also parallel to the magnetic field, resulting in no force on it.
(d) The net force on the loop is 0 N, as the forces on all three sides of the loop add up to zero.
The magnetic force on a current-carrying conductor is given by the equation F = I * L * B * sin(θ), where I is current, L is the length of the conductor, B is the magnetic field, and θ is the angle between the current and the magnetic field.
(a) The 130 cm side of the loop has the current and magnetic field parallel to each other (θ = 0°), resulting in sin(θ) = 0, and hence no force (0 N).
(b) The 50.0 cm side of the loop is perpendicular to the magnetic field (θ = 90°), resulting in sin(θ) = 1, but since the length of this side is zero, the force is also zero (0 N).
(c) The 120 cm side of the loop has the current and magnetic field parallel to each other (θ = 0°), resulting in sin(θ) = 0, and hence no force (0 N).
(d) As the forces on all three sides of the loop add up to zero, the net force on the loop is also zero (0 N).
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use a992 steel and select the most economical w shape for the beam. the beam weight is not included in the service loads shown.
a. Use LRFD b. Use ASD
To select the most economical W shape for a beam using A992 steel, we need to compare designs using both the LRFD (Load and Resistance Factor Design) and ASD (Allowable Stress Design) methods.
a. For Load and Resistance Factor Design, first determine the factored loads by applying appropriate load factors to the service loads. Next, choose an initial W shape and check if the design strength of the selected shape meets or exceeds the factored loads. Iterate this process by considering different W shapes until you find the most economical shape that meets the design requirements.
b. For Allowable Stress Design, determine the allowable loads by dividing the service loads by the corresponding load factors. Then, follow a similar procedure as in LRFD to find the most economical W shape that meets the design requirements.
In both cases, remember that the beam weight is not included in the service loads shown. To identify the most economical W shape overall, compare the designs obtained using LRFD and ASD and choose the one with the lowest cost or weight.
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Question
Use A992 steel and Select the most economical W shape for the beam. The beam weight is not included in the service loads shown.
a. Use LRFD
b. Use ASD
a stationary source produces a sound wave at a frequency of 100 hz. the wave travels at 1125 feet per second. a car is moving toward the sound source at a speed of 100 feet per second. what is the wavelength of the stationary sound source and the wavelength that a person in the car perceives? (1 point) responses wavelength of the stationary source: 11.25 ft; perceived wavelength: 10.25 ft
The wavelength of the stationary sound source if a stationary source produces a sound wave at a frequency of 100 hz and the wave travels at 1125 feet per second is 11.25 ft and the perceived wavelength by a person in the car is 10.25 ft.
The wavelength of the stationary sound source can be calculated using the formula: wavelength = speed of sound / frequency. Substituting the given values, we get:
wavelength = 1125 / 100
= 11.25 ft
Now, when the car is moving towards the sound source, the sound waves appear to be compressed or "bunched up" in front of the car, resulting in a perceived higher frequency and shorter wavelength. The perceived wavelength can be calculated using the formula:
perceived wavelength = (speed of sound - speed of car) / frequency.
Substituting the given values, we get:
perceived wavelength = (1125 - 100) / 100
= 10.25 ft
Therefore, the wavelength of the stationary sound source is 11.25 ft and the perceived wavelength by a person in the car is 10.25 ft.
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A step-down transformer produces a voltage of 5.0V across the secondary coil when the voltage across the primary coil is 110V .
What voltage appears across the primary coil of this transformer if 110V is applied to the secondary coil?
Vp=__V
When 110V is applied to the secondary coil, the voltage across the primary coil of this step-down transformer is 2420V.
A step-down transformer is a device that reduces the voltage from the primary coil to the secondary coil. In this case, the voltage across the primary coil is 110V, and the voltage across the secondary coil is 5.0V. The ratio of the number of turns in the primary coil to the number of turns in the secondary coil determines the voltage transformation.
Let's denote the primary coil's number of turns as Np and the secondary coil's number of turns as Ns. The turns ratio is Np/Ns = 110V/5.0V, which simplifies to Np/Ns = 22.
Now, if we apply 110V to the secondary coil, we can find the voltage across the primary coil (Vp) by rearranging the turns ratio formula: Vp = (Np/Ns) * Vs, where Vs is the voltage across the secondary coil.
Substituting the values, we get Vp = (22) * 110V, which results in Vp = 2420V.
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1a. Is the following statement true or false?
Based on convention, a positive torque is the one that causes clockwise rotation; a negative torque is the one that causes counterclockwise rotation.
b. Is the following statement true or false?
For a nonzero force applied on a rod, its torque can be zero.
c. Is the following statement true or false?The moment arm for a force and the line of action for the same force will always be perpendicular.
d. Is the following statement true or false?
In this experiment, we will be using the equation τ = F l , (equation 2 from lab manual), to calculate the torque of force. In this equation, l is the moment arm, which is defined as the length from the rod pivot to the point on the rod where the force is applied.
Group of answer choices
True
False
e. Is the following statement true or false?
An object with no net torque applied on it will NOT experience angular acceleration.
Group of answer choices
True
False
f. Is the following statement true or false?
Force is a vector, torque is a scalar.
Group of answer choices
True
False
Positive torque causes clockwise rotation, nonzero force applied on a rod will result in a nonzero torque unless the force is applied at the pivot point.
a. True. According to convention, a positive torque is the one that causes clockwise rotation, while a negative torque is the one that causes counterclockwise rotation.
b. False. For a nonzero force applied on a rod, its torque cannot be zero unless the force is applied at the pivot point of the rod. Torque is calculated as the product of the force and the perpendicular distance from the pivot point (moment arm) to the line of action of the force. If the force is not applied at the pivot point, the moment arm will not be zero, resulting in a nonzero torque.
c. True. The moment arm for a force and the line of action for the same force will always be perpendicular. The moment arm is the shortest distance between the line of action of the force and the pivot point, and it is perpendicular to the line of action.
d. True. In this context, the statement is true. The equation τ = F * l represents the calculation of torque, where τ is the torque, F is the magnitude of the force, and l is the moment arm (the distance from the pivot point to the point of force application on the rod).
e. True. An object with no net torque applied to it will not experience angular acceleration. According to Newton's second law for rotational motion, the net torque acting on an object is directly proportional to its angular acceleration. If there is no net torque (sum of all torques is zero), the object will not experience angular acceleration.
f. False. Force is a vector quantity, meaning it has both magnitude and direction. Torque, on the other hand, is a vector quantity as well since it involves the cross product of force and moment arm. It has both magnitude and direction, making it a vector too.
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place in the correct order how new oceanic crust is formed from mantle rock at divergent boundaries, with the first step on top.
The correct order of how new oceanic crust is formed from mantle rock at divergent boundaries is: upwelling of mantle rock, formation of basaltic lava, spreading of lava to form new oceanic crust, formation of hydrothermal vents, and subduction of oceanic crust at a subduction zone.
The formation of new oceanic crust at divergent boundaries is a continuous process that involves several steps. The first step in the process is the upwelling of mantle rock to the ocean floor. This is caused by the divergence of the tectonic plates, which creates a gap that is filled by molten rock from the mantle.
Once the mantle rock reaches the surface, it cools and solidifies to form basaltic lava. This lava then spreads out and covers the ocean floor, forming a thin layer of new oceanic crust. As the lava cools, it contracts and forms cracks, which are filled with mineral-rich seawater that solidifies to form hydrothermal vents.
Over time, the new oceanic crust continues to move away from the divergent boundary and is pushed beneath the continental crust at a subduction zone. This process causes the oceanic crust to be recycled back into the mantle and creates a continuous cycle of new crust formation and destruction.
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Rich in interstellar matter, tend to be young blue stars. They lack regular structure. What does the Hubble classification scheme do?
The Hubble classification scheme categorizes galaxies based on their visual appearance and provides a way to classify galaxies into different types based on their structure.
Galaxies that are rich in the interstellar matter and have young blue stars are typically irregular galaxies. Irregular galaxies lack the regular structure of spiral and elliptical galaxies, and their appearance can vary widely. To better understand the different types of galaxies, astronomer Edwin Hubble developed a classification system based on their visual appearance. The Hubble classification scheme categorizes galaxies into three main types: spiral, elliptical, and irregular. Spiral galaxies have a distinctive spiral structure, while elliptical galaxies are more spheroid in shape. Irregular galaxies, as the name suggests, lack any regular structure. The Hubble classification system has been refined over time and is still used today to categorize galaxies based on their appearance and study the evolution of galaxies.
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when comparing mediums, the speed of a sound wave in air will be faster in the medium that is denser.
No, the speed of sound wave in air will not be faster in the medium that is denser.
The speed of sound in a medium depends upon the elasticity and density of the medium. Generally, Sound waves travel faster in denser materials and slower in less dense materials, but this is nit necessary in the case of air
Air is a gas and its density is relatively low compared with other materials. The speed of sound in air is lower than the speed of sound in liquids and solids, despite that air is less dense
The reason for this is that the speed of sound in a material depends not only on the density but also on the elasticity of the material. Air is less elastic than liquids and solids, which makes it harder for sound waves to travel through it
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When comparing the speed of sound waves in different mediums, it is important to consider the density and elasticity of the medium, as these factors will have a significant impact on how quickly sound waves can propagate through the medium.
In general, sound waves travel faster in denser mediums, as the molecules in a denser medium are more closely packed together, allowing sound waves to propagate more quickly.
For example, if we compare the speed of sound in air and water, we can see that water is denser than air, so sound waves will travel faster in water than in air. This is why we can hear sounds from underwater sources (like whales or submarines) more easily when we are also underwater, as the sound waves are able to travel more quickly through the denser water.
Similarly, if we compare the speed of sound in air and a solid material (like a metal), we can see that the sound waves will travel even faster in the solid material, as the molecules are even more tightly packed together. This is why we can hear sounds through walls or doors, as the sound waves can travel through the solid material more easily than through the air.
Overall, when comparing the speed of sound waves in different mediums, it is important to consider the density and elasticity of the medium, as these factors will have a significant impact on how quickly sound waves can propagate through the medium.
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modern railway tracks consist of continuous welded-steel rails of 1.0 km lengths. if the coefficient of linear expansion for steel is 11 x 10-6 k-1, by how much would such rail change in length between the highest summer temperature (40oc) and the lowest winter temperature (-40oc)?group of answer choices44 cm4.4 cm0.88 mm88 cmnone of the other answers is correct
Rail length changes by 88 mm (option d) between extreme temperatures.
To calculate the change in length of the rail between the highest summer temperature and the lowest winter temperature, we can use the formula:
ΔL = L * α * ΔT
where:
ΔL is the change in length,
L is the original length of the rail (1.0 km = 1000 m),
α is the coefficient of linear expansion for steel (11 x 10^(-6) K^(-1)),
ΔT is the temperature difference (40°C - (-40°C) = 80°C).
Plugging in the values:
ΔL = 1000 * (11 x 10^(-6)) * 80
ΔL = 0.088 m = 88 mm
Therefore, the rail would change in length by 88 mm between the highest summer temperature and the lowest winter temperature. So the correct answer is 88 cm.
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At t=20∘c , how long must an open organ pipe be to have a fundamental frequency of 299 hz ?
If this pipe is filled with helium, what is its fundamental frequency?
The length of the pipe filled with helium should be approximately 1.616 m
Assuming the speed of sound in air at 20°C is 343 m/s and neglecting end corrections, the length L of an open organ pipe (also known as a flute) needed to produce a fundamental frequency f is given by:
L = λ/2, where λ is the wavelength of the sound wave and is related to the speed of sound and the frequency by the formula λ = v/f.
Thus, for air at 20°C:
λ = v/f = 343 m/s / 299 Hz = 1.147 m
L = λ/2 = 0.5735 m
Therefore, the length of the open organ pipe at 20°C should be approximately 0.5735 m.
If the same pipe is filled with helium, the speed of sound changes because helium has a lower density than air. Assuming the temperature remains constant, the speed of sound in helium is about 965 m/s. The new wavelength λ' is still given by λ' = v/f, but now we have:
λ' = 965 m/s / f
Since the fundamental frequency f remains constant, the new length L' of the pipe is: L' = λ'/2 = (965/2) / 299 Hz = 1.616 m
Therefore, the length of the pipe filled with helium should be approximately 1.616 m
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A 3.0-m-long ladder leans against a frictionless wall at an angle of 60 degree. What is the minimum value of mu_s, the coefficient of static friction with the ground, that prevents the ladder from slipping?
The minimum value of the coefficient of static friction with the ground, μₛ, that prevents the ladder from slipping is 0.5.
When a ladder leans against a wall, the force of gravity acting on the ladder can be resolved into two components: one perpendicular to the wall and one parallel to the wall.
The perpendicular component of the weight of the ladder acts at the point where the ladder makes contact with the ground, and it provides the normal force N that prevents the ladder from falling through the ground.
The parallel component of the weight of the ladder acts at the same point, but in the opposite direction to the frictional force f, which prevents the ladder from slipping.
The condition for the ladder to remain in static equilibrium is that the frictional force f must be greater than or equal to the parallel component of the weight of the ladder, which is given by (mg)sin(60°), where m is the mass of the ladder and g is the acceleration due to gravity.
Thus, we have:
f ≥ (mg)sin(60°)
μₛN ≥ (mg)sin(60°)
μₛmgcos(60°) ≥ (mg)sin(60°)
μₛ ≥ tan(60°)
μₛ ≥ √3
μₛ ≥ 0.5 (rounded to one decimal place)
Therefore, the minimum value of the coefficient of static friction is 0.5.
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12. a billiard ball moving at 60 meters per second collides elastically with a billiard ball of the same mass, which is initially at rest. determine the final velocity of the first ball.
Answer:
The velocity of the incoming billiard ball would become [tex]0\; {\rm m\cdot s^{-1}}[/tex] after the collision.
Explanation:
Since the collision is elastic, both momentum and kinetic energy would be conserved.
Let [tex]m[/tex] denote the mass of each ball.
Let [tex]u_{\text{a}} = 60\; {\rm m\cdot s^{-1}}[/tex] denote the initial velocity of the incoming ball. Let [tex]v_{\text{a}}[/tex] denote the velocity of that ball after the collision.
Let [tex]u_{b} = 0\; {\rm m\cdot s^{-1}}[/tex] denote the initial velocity of the ball that was stationary before the collision. Let [tex]v_{\text{b}}[/tex] denote the velocity of that ball right after the collision.
Sum of momentum before collision: [tex]m\, u_{\text{a}} + m\, u_{\text{b}}[/tex], which simplifies to [tex]m\, u_{\text{a}}[/tex] since [tex]u_{b} = 0\; {\rm m\cdot s^{-1}}[/tex].
Sum of momentum after collision: [tex]m\, v_{\text{a}} + m\, v_{\text{b}}[/tex].
For momentum to conserve:
[tex]m\, v_{\text{a}} + m\, v_{\text{b}} = m\, u_{\text{a}} + m\, u_{\text{b}}[/tex].
[tex]m\, v_{\text{a}} + m\, v_{\text{b}} = m\, u_{\text{a}}[/tex].
[tex]v_{\text{a}} + v_{\text{b}} = u_{\text{a}}[/tex]. ([tex]m \ne 0[/tex].)
Similarly, the sum of kinetic energy before the collision would be [tex](1/2)\, m\, {u_{\text{a}}}^{2} + (1/2)\, m\, {u_{\text{b}}}^{2}[/tex] and simplifies to [tex](1/2)\, m\, {u_{\text{a}}}^{2}[/tex].
Sum of kinetic energy after the collision: [tex](1/2)\, m\, {v_{\text{a}}}^{2} + (1/2)\, m\, {v_{\text{b}}}^{2}[/tex].
For kinetic energy to conserve:
[tex]\displaystyle \frac{1}{2}\, m\, {v_{\text{a}}}^{2} + \frac{1}{2}\, m\, {v_{\text{b}}}^{2} = \frac{1}{2}\, m\, {u_{\text{a}}}^{2} + \frac{1}{2}\, m\, {u_{\text{b}}}^{2}[/tex].
[tex]\displaystyle \frac{1}{2}\, m\, {v_{\text{a}}}^{2} + \frac{1}{2}\, m\, {v_{\text{b}}}^{2} = \frac{1}{2}\, m\, {u_{\text{a}}}^{2}[/tex].
[tex]{v_{\text{a}}}^{2} + {v_{\text{b}}}^{2} = {u_{\text{a}}}^{2}[/tex]. ([tex]m \ne 0[/tex].)
Hence:
[tex]\left\lbrace\begin{aligned}& v_{\text{a}} + v_{\text{b}} = u_{\text{a}} \\ & {v_{\text{a}}}^{2} + {v_{\text{b}}}^{2} = {u_{\text{a}}}^{2}\end{aligned}\right.[/tex].
It is given that [tex]u_{\text{a}} = 60\; {\rm m\cdot s^{-1}}[/tex]. Solve this system for [tex]v_{\text{a}}[/tex] and [tex]v_{\text{b}}[/tex].
Rearrange to obtain [tex]v_{\text{b}} = u_{\text{a}} - v_{\text{a}}[/tex]. Substitute this expression into the equation [tex]{v_{\text{a}}}^{2} + {v_{\text{b}}}^{2} = {u_{\text{a}}}^{2}[/tex]:
[tex]{v_{\text{a}}}^{2} + (u_{\text{a}} - v_{\text{a}})^{2} = {u_{\text{a}}}^{2}[/tex].
[tex]{v_{\text{a}}}^{2} + {u_{\text{a}}}^{2} - 2\, u_{\text{a}}\, v_{\text{a}} + {v_{\text{a}}}^{2} = {u_{\text{a}}}^{2}[/tex].
[tex]2\, {v_{\text{a}}}^{2} - 2\, u_{\text{a}}\, v_{\text{a}} = 0[/tex].
[tex]v_{\text{a}}\, (v_{\text{a}} - u_{\text{a}}) = 0[/tex].
By the Factor Theorem, either [tex]v_{\text{a}} = 0[/tex], or [tex](v_{\text{a}} - u_{\text{a}}) = 0[/tex] such that [tex]v_{\text{a}} = u_{\text{a}} = 60\; {\rm m\cdot s^{-1}}[/tex].
However, since there was a collision, velocity of the incoming ball cannot stay unchanged. Thus, the only possible solution is [tex]v_{\text{a}} = 0[/tex], meaning that the incoming ball would have stopped completely after the collision.
The final velocity of the first billiard ball after the collision is zero.
An elastic collision between two billiard balls of equal mass. Given that the initial velocity of the first ball is 60 m/s and the second ball is at rest, you can use the conservation of momentum and the conservation of kinetic energy to determine the final velocities.
In an elastic collision between two objects with equal mass, the final velocity of the first object (V1f) will be 0 m/s, and the final velocity of the second object (V2f) will be equal to the initial velocity of the first object (V1i).
So in this case, the final velocity of the first ball will be 0 m/s.
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Three liquids are at temperatures of 13 ◦C, 22◦C, and 36◦C, respectively. Equal masses of the first two liquids are mixed, and the equilibrium temperature is 18◦C. Equal masses of the second and third are then mixed, and the equilibrium temperature is 26.3 ◦C. Find the equilibrium temperature when equal masses of the first and third are mixed. Answer in units of ◦C.
The equilibrium temperature when equal masses of the first and third liquids are mixed is 24.5°C.
Equilibrium temperature is the temperature at which two or more substances, initially at different temperatures, attain the same final temperature when brought into thermal contact without any heat loss to the surroundings. It represents the state of thermal equilibrium between the substances.
Let the specific heat capacity of the liquids be denoted by C, and the masses of each be m.
For the first mixing, the heat lost by the hotter liquid (36°C) is equal to the heat gained by the colder liquid (13°C). Thus:
C * m * (36 - T) = C * m * (T - 13)
where T is the equilibrium temperature. Solving for T, we get:
T = (36 + 13)/2 = 24.5°C
For the second mixing, we have:
C * m * (T - 22) = C * m * (36 - T)
Solving for T, we get:
T = (22 + 36)/2 = 29°C
Finally, for the mixing of the first and third liquids, we have:
C * m * (T - 13) = C * m * (36 - T)
Solving for T, we get:
T = (13 + 36)/2 = 24.5°C
Therefore, When the first and third liquids are combined in equal masses, the equilibrium temperature is 24.5°C.
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