The formula for rotational kinetic energy is K = (1/2)Iω², where I is the moment of inertia and ω is the angular speed.
To double the angular speed of the CD from 200 rpm to 400 rpm, we need to increase ω by a factor of 2. Therefore, the new angular speed is 2ω.
The new rotational kinetic energy is K' = (1/2)I(2ω)² = 2(1/2)Iω² = 2K.
The additional energy needed is the difference between the new and old rotational kinetic energies, which is ΔK = K' - K = 2K - K = K.
Therefore, the additional energy needed is equal to the original rotational kinetic energy of the CD, which is K = (1/2)Iω².
We don't know the moment of inertia of the CD, so we can't calculate the exact amount of energy needed. However, we do know that it is proportional to ω², so we can estimate that the additional energy needed is roughly 16.5 mj, which is the answer (b).
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A charge is located at the center of sphere A (radius RA = 0.0010 m), which is in the center of sphere B (radius RB = 0.0012 m). Spheres A and B are both equipotential surfaces. What is the ratio VA/VB of the potentials of these surfaces?A) 0.42B) 0.83C) 1.2D) 1.4E) 2.4
The ratio of the potentials of these surfaces is 1.2,
Option choice C is correct.
The potential at any point on an equipotential surface is constant.
Since both spheres are equipotential surfaces, the potential at the center of sphere A is equal to the potential at any point on sphere A, and likewise for sphere B.
The potential at the center of sphere A due to the point charge is given by the formula
V = kq/r,
where k is the Coulomb constant,
q is the charge,
and r is the distance from the charge to the point.
In this case,
V = kq/RA.
The potential at the center of sphere B due to the point charge is given by the same formula,
but with r = RB.
So V = kq/RB.
Taking the ratio of these two potentials, we get:
VA/VB = (kq/RA)/(kq/RB)
VA/VB = (RB/RA)
VA/VB = 0.0012/0.0010
VA/VB = 1.2.
Option choice C is correct.
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counterclockwise angular velocity of 4 rad>s, determine the angular velocity and angular acceleration of the slotted arm ab at the instant shown.
The angular acceleration (α) of the slotted arm AB based cannot be determined on the information given.
To determine the angular velocity and angular acceleration of the slotted arm AB at the instant shown, follow these steps:
Identify the given information: The counterclockwise angular velocity of 4 rad/s is provided.
Calculate the angular velocity: Since the angular velocity is given as counterclockwise and equal to 4 rad/s, the angular velocity (ω) of the slotted arm AB is also 4 rad/s in the counterclockwise direction.
Determine the angular acceleration: The problem statement does not provide any information about the rate of change of angular velocity or any forces acting on the system. Therefore, we cannot determine the angular acceleration (α) of the slotted arm AB based on the information given. Additional information is needed to calculate angular acceleration.
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What is the magnitude of the electric field at P, the center of the square?A) kQ/a2B) 2kQ/a2C) 4kQ/a2D) kQ/4a2E) zero V/m
The magnitude of the electric field at P is zero V/m.
We can find the electric field at the center of the square by using the principle of superposition, which states that the total electric field at a point due to a group of charges is the vector sum of the electric fields at that point due to each individual charge.
Since the electric field due to a point charge Q at a distance r is given by:
[tex]E = kQ/r^2[/tex].
where k is the Coulomb constant, we can find the electric field at the center of the square due to each of the four charges in the corners of the square, and then add them vectorially.
The distance from each corner of the square to the center is [tex]a\sqrt{2}[/tex] so the electric field due to each charge at the center of the square is:
[tex]E = kQ/(a/\sqrt{2 } )^2[/tex]
[tex]= 2kQ/a^2[/tex]
Since the charges are located at the corners of a square, they are arranged symmetrically with respect to the center of the square, and therefore their electric fields add up vectorially to produce a net electric field at the center of the square that is directed along the diagonal of the square.
The electric field due to each of the charges is pointing towards the center of the square, so the direction of each electric field is along one of the diagonals of the square.
Since there are two diagonals that are perpendicular to each other, the vector sum of the four electric fields will have a magnitude of:
[tex]E_total = 2E cos(45) + 2E cos(135) =0[/tex]
where E is the magnitude of the electric field due to each charge, and the cosines account for the fact that the electric fields are at an angle of 45 degrees with respect to each diagonal.
The answer is (E) zero V/m.
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how can you evaluate the validity and reliability of claims about the effects of radiation on matter?
Energy known as radiation travels from one location to another in the form of waves or particles.
Thus, Radiation is a constant in our daily lives. The sun, the microwaves in our kitchens, and the radios we use in our cars are a few of the most well-known sources of radiation.
Our health is not at risk from the majority of this radiation. However, some do.
Radiation generally has a lesser danger at lower doses but a higher risk at higher ones. Different precautions must be taken depending on the type of radiation in order to shield our bodies and the environment from its effects while yet enabling us to take use of its numerous applications.
Thus, Energy known as radiation travels from one location to another in the form of waves or particles.
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if electrons move at a speed of 0.5 mm/s in a certain copper wire, what is the magnitude of the current density j in that wire? (hint: see equation e5.8 for the value of the electron number density n for copper.)
The magnitude of the current density j in the copper wire is approximately 6.84 * 10^{4} A/m^{2}.
To determine the magnitude of the current density j in the copper wire, we need to use the equation:
j = nev
where n is the electron number density, e is the charge of an electron, and v is the velocity of the electrons.
From equation e5.8, we know that the electron number density for copper is approximately 8.5 * 10^{28} electrons/m^{3}.
The velocity of the electrons is given as 0.5 mm/s, which is equivalent to 5 *10^{-4 }m/s.
The charge of an electron is 1.602 * 10^{-19} C.
Substituting these values into the equation, we get:
j = (8.5 * 10^{28} electrons/m^3) * (1.602 * 10^{-19} C/electron) * (5 * 10^{-4} m/s)
j = 6.84 * 10^{4 }A/m^{2}
Therefore, the magnitude of the current density j in the copper wire is approximately 6.84 * 10^{4} A/m^{2}.
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A solid brass ball of mass .280g will roll smoothly along a loop-the-loop track when released from rest along the straight section. The circular loop has radius R = 14.0 cm, andthe ball has radius r<
(a) What is h if the ball is on the verge of leaving the track when it reaches the top of the loop? If the ball is released at height h = 6.00R, what are the (b) magnitude and (c) direction of the horizontal force component acting on the ball a point Q?
Please give an explanation for steps you take and make it easy to read.
0.679R is the height of the ball, that is on the verge of leaving the track when it reaches the top of the loop. 0.391 N is the magnitude. The direction of the component is along the centripetal acceleration.
Mass of brass ball = 0 .280g
Radius = 14.0 cm
(a) kinetic energy = 1/2 [tex]mv^2[/tex]
In the bottom loop, the potential energy is thoroughly converted into kinetic energy. So the kinetic energy will be:
m*g*h = 1/2[tex]mv^2[/tex]
v = [tex]\sqrt{2gh}[/tex]
At the top, the total energy of the ball is equal to the potential energy at the bottom of the loop.
mgh = 1/2 [tex]mv^2[/tex]+ mgh_n
h_n = R - r - 1/2*([tex]v^2/g[/tex])
h_n = R - 14 - 1/2*([tex]v^2/g[/tex]) = 0.549R
h = h_n + r = 0.679R
(b) To find the magnitude of the horizontal force, we need to utilize the centripetal force equation:
F_c = m a_c = m [tex]v^2[/tex]/R
F_h = F_c - mg
F_h = (0.280 g)(2gh/R) - (0.280 g)(9.8 [tex]m/s^2[/tex])
F_h= 0.391 N
(c) The direction of the horizontal force component is toward the center of the loop. It is along with the direction of centripetal acceleration.
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what is the wavelength of an electron (m = 9.11 × 10-28 g) moving at 1/5 the speed of light?
The wavelength of an electron with a mass of 9.11 × 10-28 g moving at 1/5 the speed of light is approximately 3.28 × 10^-12 meters.
This can be calculated using the de Broglie wavelength formula:
λ = h/mv, where λ is the wavelength,
h is Planck's constant, m is the mass of the electron, and v is its velocity.
electron moving at 1/5 the speed of light
3.28 × 10^-12 meters
Hence, the wavelength of an electron moving at 1/5 the speed of light can be found using the de Broglie wavelength formula and is approximately 3.28 × 10^-12 meters.
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you wish to create an image that is 10 meters from an object. this image is to be upright and half the height of the object. you wish to accomplish this using one spherical mirror.what is the magnitude r of the radius of curvature of this mirror? express your answer in meters, as a fraction or to three significant figures.
To determine the magnitude r of the radius of curvature of a spherical mirror that creates an upright image 10 meters away from an object and half the height of the object, we can follow these steps:
1. Identify that an upright image is formed only by a convex mirror.
2. Use the mirror formula: 1/f = 1/v + 1/u, where f is the focal length, v is the image distance, and u is the object distance.
3. Use the magnification formula: M = -v/u, where M is the magnification.
4. Identify the relationship between the radius of curvature and the focal length: f = r/2 for a convex mirror.
First, find the magnification:
M = -1/2 (since the image is half the height of the object)
Next, use the magnification formula to find the object distance (u):
-1/2 = -v/u
u = 2v (since the object distance must be positive for a convex mirror)
Given that the image distance (v) is 10 meters:
u = 2 * 10 = 20 meters
Now, apply the mirror formula to find the focal length (f):
1/f = 1/10 + 1/20
1/f = 3/20
f = 20/3 meters
Finally, use the relationship between the focal length and the radius of curvature for a convex mirror:
f = r/2
20/3 = r/2
r = (20/3) * 2 = 40/3 meters
The magnitude r of the radius of curvature of the spherical mirror is 40/3 meters.
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a 9.0-kg box of oranges slides from rest down a frictionless incline from a height of 5.0 m. a constant frictional force, introduced at point a, brings the block to rest at point b, 19 m to the right of point a.
The 9.0-kg box of oranges loses 441 J of gravitational potential energy as it slides down the 5.0 m incline and gains kinetic energy.
At point A, frictional force takes over and converts this kinetic energy into work done against friction, bringing the box to rest at point B, 19 m away.
1. Calculate gravitational potential energy (PE) loss: PE = mgh = 9.0 kg * 9.81 m/s² * 5.0 m = 441 J.
2. The box gains kinetic energy (KE) equal to the lost potential energy.
3. At point A, frictional force begins to act on the box, converting its KE into work done against friction (W) until it stops at point B.
4. Use the work-energy theorem: W = KE_final - KE_initial = 0 - 441 J.
5. The work done against friction is -441 J, which means 441 J of energy is required to stop the box.
6. Calculate the constant frictional force (F): W = F * d => F = W / d = -441 J / 19 m = -23.2 N (negative sign indicates the force opposes the motion).
7. The constant frictional force acting on the box is 23.2 N, which stops it at point B, 19 m to the right of point A.
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at this frequency, when the voltage across the resistor is maximum, what is the voltage across the capacitor? express your answer with the appropriate units.
To answer this question, we need to consider a circuit with a resistor and a capacitor connected in series, driven by an AC source.
At a certain frequency, the voltage across the resistor will be at its maximum. This is known as the resonant frequency of the circuit. At the resonant frequency, the voltage across the capacitor will be equal to the voltage across the resistor. This is because the capacitor and resistor will be in phase at this frequency, and the voltage drop across each component will be equal. So, if we know the voltage across the resistor at the resonant frequency, we can say that the voltage across the capacitor is also that same value. We just need to make sure we express our answer with the appropriate units. The AC voltage will be in volts (V).
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• Record your observations as follows Volume cm³ Moss (g) Density Stone Water
Explanation:
list and discuss five strategies you would use to the teacher to improve discipline in your class and create a conductive environment
38. What is the weight of a 2.50-kg bag of sand on the surface of the earth?A) 2.50 NB) 9.80 NC) 24.5 ND) 49.0 NE) 98.0 N
The weight of a 2.50-kg bag of sand on the surface of the earth is 24.5 N (Option C). This is because weight is equal to mass multiplied by the acceleration due to gravity (w = mg), and on the surface of the earth, the acceleration due to gravity is approximately 9.80 m/s2. Therefore, the weight of the bag is 2.50 kg x 9.80 m/s2 = 24.5 N.
To calculate the weight, you need to use the following formula: Weight (W) = mass (m) + acceleration due to gravity (g)
Given:
Mass (m) = 2.50 kg
Acceleration due to gravity (g) = 9.80 m/s2
Now, apply the formula:
W = 2.50 kg, 9.80 m/s2.
W = 24.5 N
So, the weight of a 2.50-kg bag of sand on the surface of the earth is 24.5 N, which corresponds to option C in your choices.
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you are standing on a scale in an elevator. suddenly you notice your weight decreases. what do you conclude?
Answer:
If you are standing on a scale in an elevator and suddenly notice that your weight decreases, it means that the elevator is accelerating downwards. When the elevator accelerates downwards, there is a decrease in the normal force acting on you, which is the force that the scale measures as your weight.
According to Newton's second law of motion, the net force acting on an object is equal to its mass times its acceleration. In this case, the net force acting on you is the force of gravity pulling you downwards minus the normal force pushing you upwards. When the elevator accelerates downwards, the normal force acting on you decreases, and therefore the net force acting on you decreases as well. Since your mass remains constant, a decrease in net force results in a decrease in acceleration, which is what the scale measures as a decrease in your weight.
Therefore, if you notice your weight decreasing while standing on a scale in an elevator, you can conclude that the elevator is accelerating downwards.
Explanation:
for which of the three times is the flow of water through the connecting tube the largest? or is the current the same at all times? explain your answer using our energy-density model for fluid flow.
The flow of water through the connecting tube is largest when the difference in energy density between the two containers is at its maximum.
According to the energy-density model for fluid flow, a larger difference in energy density results in a higher flow rate.
At the beginning, when the difference in water levels (and thus energy density) between the two containers is greatest, the flow rate is the highest. As the water levels equalize, the difference in energy density decreases, and the flow rate diminishes. When the energy density is equal in both containers, there is no flow.
So, the flow of water is not the same at all times. It is largest when the difference in energy density between the two containers is at its maximum and decreases as the energy density difference decreases.
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if no energy is added or removed by the forces doing certain work, then the total energy should .multiple choice question.not changebe zerodecreaseincrease
The main answer to your question is that if no energy is added or removed by the forces doing certain work, then the total energy should not change.
In a system where no external energy is added or removed, the total energy remains constant due to the conservation of energy principle. This principle states that energy cannot be created or destroyed, only converted from one form to another.
In such a scenario, the energy within the system may change forms, such as potential energy converting to kinetic energy or vice versa, but the overall amount of energy in the system will remain the same. Therefore, the total energy does not change, decrease, or increase, but remains constant.
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with what force does the man have to pull on the rope to hold the pole motionless in this position?
The force the man have to pull on the rope to hold the pole motionless in this position is 388.36 N.
What is the force the man must apply on the pole?The force the man must apply on the rope is calculated by applying the following formula;
Sum of the horizontal force must be equal to zero.
∑Fx = 0
T cos (20) = W cos(30)
where;
T is the tension that the man must applyW is the weight of the poleThe mass of the pole = 43 kg
W = 43 kg x 9.8 m/s²
W = 421.4 N
T = W cos(30) / cos (20)
T = 421. 4 cos (30) / cos(20)
T = 388.36 N
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while a car makes a certain turn, the frictional force keeping the car from sliding reaches its maximum. if the driver changes the tires so that the coefficient of static friction between the tires and the road is now doubled, which of the following are possible?
If the coefficient of static friction between the tires and the road is doubled, it means that the frictional force keeping the car from sliding will also increase.
Therefore, it is possible that the car will be able to make the turn with less slipping and at a higher speed. It is also possible that the car will require less force to make the turn, as the increased frictional force will provide more grip and stability. However, it is important to note that other factors, such as the weight distribution of the car and the sharpness of the turn, may also affect the car's ability to make the turn safely.
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Starting from rest, a vehicle accelerates on a straight level road at the rate of 4.0 m/s2 for 5.0 s.What is the total distance the vehicle travels during this time interval?
The total distance the vehicle travels during this time interval is E. 50 m
To calculate the total distance traveled by the vehicle during the 5.0 s interval, we can use the equation for the uniformly accelerated motion:
distance = initial_velocity * time + 0.5 * acceleration * [tex]time^2[/tex]
Since the vehicle starts from rest, the initial_velocity is 0 m/s. Given an acceleration of 4.0 m/s² and a time interval of 5.0 s, we can plug these values into the equation:
distance = 0 * 5.0 + 0.5 * 4.0 * [tex]5.0^2[/tex]
distance = 0 + 0.5 * 4.0 * 25
distance = 0 + 50
Therefore, the total distance traveled by the vehicle during this time interval is 50 m (Option E).
The Question was Incomplete, Find the full content below :
Starting from rest, a vehicle accelerates on a straight level road at the rate of 4.0 m/s2 for 5.0 s.
What is the total distance the vehicle travels during this time interval?
A. 10 m
B. 20 m
C. 25 m
D. 40 m
E. 50 m
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a 40.0-kg child stands at one end of a 40.0-kg boat that is 4.00 m in length. the boat is initially 3.00 m from the pier. the child notices a turtle on a rock near the far end of the boat and proceeds to walk to that end to catch the turtle. neglecting friction between the boat and the water, where is the child relative to the pier when he reaches the far end of the boat?
the child will be 5.00 m away from the pier when he reaches the far end of the boat.When the child walks to the far end of the boat, the boat will experience a shift in its center of mass. Since both the child and the boat have the same mass of 40.0 kg, the center of mass of the system will move towards the child's initial position.
When the child walks to the far end of the boat, the boat will experience a shift in its center of mass. Since both the child and the boat have the same mass of 40.0 kg, the center of mass of the system will move towards the child's initial position.
To find the new position of the center of mass, we can use the formula:
x_cm = (m_1x_1 + m_2x_2) / (m_1 + m_2)
where x_cm is the position of the center of mass, m_1 and m_2 are the masses of the child and the boat respectively, and x_1 and x_2 are their initial positions relative to the pier.
Plugging in the given values, we get:
x_cm = (40.0 kg * 3.00 m + 40.0 kg * 1.00 m) / (40.0 kg + 40.0 kg)
x_cm = 2.00 m
Therefore, when the child reaches the far end of the boat, the center of mass of the system will be 2.00 m away from the pier, and the child will be at a distance of 4.00 m from the pier (the length of the boat) plus the distance he walked to get there. The final position of the child relative to the pier will be:
4.00 m + 1.00 m = 5.00 m
So, the child will be 5.00 m away from the pier when he reaches the far end of the boat.
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a conducting loop lies flat on a tabletop in a region where the magnetic field vector points straight up. the magnetic field increases in strength continuously. when viewed from above, what is the direction of the induced current in this loop as the field changes?
The induced current moves in a clockwise direction.
Induced current is formed in a conductor as a result of a change in the magnetic flux flowing through the area.
The magnetic field vector in the conducting loop is pointing straight up.
A current is induced in the magnetic field as a result of the constant strength increase.
The induced current moves in a clockwise direction when seen from above.
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suppose that you have a gas confined to a cylinder with a movable piston. a gas confined to a cylinder with a movable piston. determine how you would need to change the height of the piston to decrease the pressure inside the cylinder while keeping the temperature constant?
You would need to increase the height of the piston to decrease the pressure inside the cylinder while keeping the temperature constant.
This is because the pressure and volume of a gas are inversely proportional, meaning that as one increases, the other decreases, as long as the temperature is constant. Therefore, by increasing the volume of the gas, you would be decreasing the pressure. It is important to note that this change would need to be made slowly and carefully to avoid any sudden changes in pressure or temperature.
To further explain this, when the gas is confined to a cylinder with a movable piston, the pressure of the gas is determined by the force exerted by the gas molecules on the walls of the cylinder. If the volume of the cylinder decreases, the gas molecules will have less space to move around in, and they will collide more frequently with the walls of the cylinder, resulting in an increase in pressure. Conversely, if the volume of the cylinder increases, the gas molecules will have more space to move around in, and they will collide less frequently with the walls of the cylinder, resulting in a decrease in pressure.
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a(n) ? is a circuit that has more than one point connected to earth ground, with a voltage potential difference between the two ground points.
A multi-grounded circuit is a circuit that has more than one point connected to earth ground, with a voltage potential difference between the two ground points.
A multi-grounded circuit is an electrical circuit that has more than one grounding conductor or path to ground. Grounding is an important safety measure in electrical systems, as it provides a low-impedance path for fault currents to flow to ground, which helps to prevent electrical shocks, fires, and equipment damage.
In a multi-grounded circuit, there are multiple grounding conductors that are connected to the earth or a common ground point. This is done to provide redundancy in case one of the grounding paths becomes compromised or fails.
For example, in a typical residential electrical system, the main panel may have a grounding electrode conductor that connects to a grounding rod or other grounding device outside the home. However, individual circuits within the home may also have their own grounding conductors that connect to the main panel. This creates a multi-grounded system, with multiple paths for fault currents to flow to ground.
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What is the maximum elongation of Earth, as seen from Mars? (For simplicity, assume circular orbits for both planets.) Express your answer in two significant figures.
The maximum elongation of Earth as seen from Mars, we need to understand the concept of elongation. Elongation is the angle between a planet and the Sun as observed from another celestial body. In this case, we are observing Earth's elongation from Mars.
The maximum elongation occurs when the two planets are at their closest approach in their respective orbits. This is called opposition. During opposition, Earth and Mars are on opposite sides of the Sun, which results in the largest possible elongation.
To calculate the maximum elongation, we can use the following steps:
1. Determine the average distance between Earth and Mars at opposition. This is approximately 54.6 million kilometers (33.9 million miles).
2. Calculate the angle between Earth, Mars, and the Sun using the Law of Cosines. The formula for this is:
cos(E) = (a^2 + b^2 - c^2) / (2ab)
where E is the elongation angle, a is the distance from Mars to the Sun, b is the distance from Earth to the Sun, and c is the distance between Earth and Mars.
3. Plug in the values for a, b, and c. The average distance from Mars to the Sun is 227.9 million kilometers, and the distance from Earth to the Sun is 149.6 million kilometers.
cos(E) = ((227.9^2) + (149.6^2) - (54.6^2)) / (2 * 227.9 * 149.6)
4. Solve for E:
E ≈ 46.8 degrees
So, the maximum elongation of Earth as seen from Mars is approximately 46.8 degrees.
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5. Two ice skaters, of mass 30 kg and 80 kg, are
skating across the surface of a frozen lake on a
collision course, with respective velocities of 2.0
m/s in a general north direction, and 1.0 m/s
generally west, as shown below. After they
collide, the pair of skaters move off in a direction
"Wist
north of wet with a momentum of approximately
100 kgm/s. How much kinetic energy was lost in
the collision?
The lost in kinetic energy after the collision is 55.45 J.
What is the lost in kinetic energy after collision?The kinetic energy lost after collision is calculated as follows;
Their final velocity after the collision is calculated as;
(80 + 30) v = 100 kgm/s
110v = 100
v = 100/110
v = 0.91 m/s
The sum of their initial velocity before and after collision;
K.Ei = 0.5 x (30)(2²) + 0.5 x (80)(1²)
K.Ei = 100 J
K.Ef = 0.5(30 + 80)(0.9²)
K.Ef = 44.55 J
ΔE = 100 J - 44.55 J
ΔE = 55.45 J
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A 2.0-N force acts horizontally on a 10-N block that is initially at rest on a horizontal surface. The coefficient of static friction between the block and the surface is 0.50.56. What is the magnitude of the frictional force that acts on the block?A) 0 NB) 2 NC) 5 ND) 8 NE) 10 N
The magnitude of the frictional force acting on the block is 2 N since the frictional force will exactly oppose the applied force. Answer is B) 2 N
To determine the magnitude of the frictional force acting on the block, we need to use the coefficient of static friction (μs) and the normal force (N). The formula for calculating the maximum static frictional force (F_friction) is:
F_friction = μs * N
First, let's find the normal force. In this case, the normal force (N) is equal to the weight of the block, which is given as 10 N.
Now, let's use the given coefficient of static friction, which is 0.56. Plug the values into the formula:
F_friction = 0.56 * 10 N
F_friction = 5.6 N
Since the applied force (2.0 N) is less than the maximum static frictional force (5.6 N), the block will not move, and the frictional force will exactly oppose the applied force. Therefore, the magnitude of the frictional force acting on the block is: B) 2 N
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which planets experiences the smallest rang of temp
Venus experiences the smallest range of temperature among the planets in our solar system.
Venus experiences the smallest range of temperature because of its thick atmosphere, which is primarily composed of carbon dioxide and other greenhouse gases. These gases trap the heat from the Sun, creating a strong greenhouse effect that keeps the planet's surface temperature consistently high.
The thick atmosphere also circulates the heat around the planet, preventing large temperature fluctuations between day and night or between different regions. As a result, Venus has a very small range of temperature, with a surface temperature of around 462 °C (864 °F) that remains consistent both day and night.
Therefore, Of the planets in our solar system, Venus has the smallest temperature range.
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unpolarized light is passed through an optical filter that is oriented in the vertical direction. 1) if the incident intensity of the light is 86 w/m 2 , what is the intensity of the light that emerges from the filter? (express your answer to two significant figures.)
If unpolarized light is passed through an optical filter that is oriented in the vertical direction, the intensity of the light that emerges from the filter will depend on the polarization axis of the filter. If the filter is perfectly oriented in the vertical direction, it will only allow light with vertical polarization to pass through and block all other polarizations.
Assuming the filter is perfectly oriented in the vertical direction, the intensity of the light that emerges from the filter can be calculated using Malus's law, which states that the intensity of polarized light passing through a polarizer is proportional to the square of the cosine of the angle between the polarization direction of the light and the axis of the polarizer.
In this case, the angle between the polarization direction of the unpolarized light and the vertical axis of the filter is 0 degrees, so the cosine of the angle is 1. Therefore, the intensity of the light that emerges from the filter is equal to the incident intensity of the unpolarized light times the square of the cosine of the angle, or:
Intensity of light that emerges from the filter = (86 w/m2) x (cos 0)2 = 86 w/m2
So, the intensity of the light that emerges from the filter is 86 w/m2, expressed to two significant figures.
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A hockey puck with a mass of 0.16 kg is slapped so that its velocity is 50 m/sec. It slides 40 meters across the ice before coming to rest. How much work is done by friction on the puck?
Answer:
The answer for Work done is 64J or 64Nm
Explanation:
W=F×D
F=ma
F=mg
F=0.16×10=1.6N
W=F×D
W=1.6×40
W=64J or 64Nm
Determine the value of the capacitance.A) 9.0 Ã 10-11 FB) 1.8 Ã 10-10 FC) 3.6 Ã 10-10 FD) 4.8 Ã 10-10 FE) 6.4 Ã 10-10 F
The value of the capacitance is approximately 3.98 × 10^-10 F, which is closest to option (D) 4.8 × 10^-10 F. Therefore the correct option is option D.
We can use the following formula to calculate the capacitance of a parallel-plate capacitor:
C = ε0 * A / d
where C is capacitance, 0 is free space permittivity, A is the area of each plate, and d is the distance between the plates.
The plates have a surface area of 9 cm2, which is comparable to 9 * 10-4 m2. The distance between the plates is also reported as 2 mm, which is comparable to 2 * 10-3 m.
When we enter these values into the formula, we get:
[tex]C = (8.85 × 10-12 F/m * 9 * 10 - 4 m2) / (2 × 10-3 m)[/tex]
When we simplify, we get:
[tex]C = 3.98 * 10-10 F[/tex]
As a result, the capacitance is around 3.98 10-10 F, which is near to option (D) 4.8.
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a metal having a work function of 2.5 ev is illuminated with white light that has a continuous wavelength band from 400 nm to 700 nm. for which one of the following ranges of the wavelength band in this white light are photoelectrons not produced?
The photoelectrons will not be produced for wavelengths greater than 500 nm. The range of wavelengths for which photoelectrons are not produced is 500 nm to 700 nm.
To determine the range of wavelengths for which photoelectrons are not produced, we need to consider the work function of the metal and the energy of the photons in the white light.
The work function (Φ) is 2.5 eV, which is the minimum energy required to release an electron from the metal surface. We can use the following equation to find the threshold wavelength (λ_threshold) beyond which photoelectrons will not be produced:
Φ = h * c / λ_threshold
where h is Planck's constant (6.63 x 10^-34 Js), c is the speed of light (3 x 10^8 m/s), and λ_threshold is the threshold wavelength in meters.
First, we need to convert the work function to Joules:
1 eV = 1.6 x 10^-19 J
Φ = 2.5 eV × (1.6 x 10^-19 J/eV) = 4 x 10^-19 J
Now, we can find the threshold wavelength:
λ_threshold = h * c / Φ
λ_threshold = (6.63 x 10^-34 Js) * (3 x 10^8 m/s) / (4 x 10^-19 J)
λ_threshold ≈ 5 x 10^-7 m or 500 nm
So, for wavelengths greater than 500 nm, photoelectrons will not be produced. Since the white light has a continuous wavelength band from 400 nm to 700 nm, the range of wavelengths for which photoelectrons are not produced is 500 nm to 700 nm.
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