A resistor is not a very good______.​

Answer:

The basic concept of how a simple motor works is that you put electricity into it at one end and an axle (metal rod) rotates at the other end giving you the power to drive a machine of some kind. The simple motors you see explained in science books are based on a piece of wire bent into a rectangular loop, which is suspended between the poles of a magnet. In order for a motor to run on AC, it requires two winding magnets that don’t touch. They move the motor through a phenomenon known as induction.

I hope this helps! Let me know if I'm wrong!

Explanation:

The bicycle travels from a to b. half the time it travels with speed 20 km/h, and half the time with the speed 30 km/h, therefore the average speed of the bicycle is 25 km/h.

To find the average speed of the bicycle, we need to use the formula:

Average Speed = Total Distance / Total Time

Since we don't know the distance between points A and B, we can assume it to be 'd' kilometers.

Let's say the time taken by the bicycle to travel from A to B is 't' hours.

According to the problem statement, the bicycle travels at 20 km/h for half the time and 30 km/h for the other half. This means that it covers the first half of the distance at 20 km/h and the second half at 30 km/h.

Hence, the time taken to cover the first half of the distance is (t/2) hours, and the time taken to cover the second half is also (t/2) hours.

Now, we can calculate the total time taken by the bicycle as follows:

Total Time = (t/2) + (t/2) = t hours

Next, we can calculate the total distance traveled by the bicycle as follows:

Total Distance = Distance Covered in First Half + Distance Covered in Second Half
                = (20 km/h) x (t/2) + (30 km/h) x (t/2)
                = 25t km

Substituting these values in the formula for average speed, we get:

Average Speed = Total Distance / Total Time
                   = 25t km / t hours
                   = 25 km/h

Therefore, the average speed of the bicycle is 25 km/h.

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The electric field produced by the disk at point P along the x-axis is approximately 333.89 N/C.

Since the disk lies in the y-z plane, the electric field produced by the disk will only have an x-component, which can be calculated using the formula for the electric field produced by a charged disk:

E = σ / (2ε₀) * [1 - (z / √(R² + z²))]

At point P(1.01 m, 0.00 m), the distance from the disk along the z-axis is z = 0, so the formula reduces to:

E = σ / (2ε₀) = (5.88 × 10^-6 C/m²) / (2 * 8.85 × 10^-12 F/m) ≈ 333.89 N/C

Therefore, the electric field produced by the disk is 333.89 N/C.

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The pH after 15.0 mL of 0.175 M NaOH has been added is 11.58.

The balanced equation for the reaction between formic acid (HCOOH) and sodium hydroxide (NaOH) is:

[tex]HCOOH + NaOH $\rightarrow$ NaCOOH + H$_2$O[/tex]

First, we need to determine how many moles of HCOOH are present in the initial 30.00 mL sample:

moles of HCOOH = (0.125 mol/L) x (0.03000 L) = 0.00375 mol

Next, we can use the stoichiometry of the reaction to determine how many moles of NaOH are required to neutralize all of the HCOOH:

1 mol HCOOH reacts with 1 mol NaOH

moles of NaOH = 0.00375 mol

Now, we can calculate the concentration of NaOH after 15.0 mL has been added:

final volume = 30.00 mL + 15.0 mL = 45.00 mL = 0.04500 L

moles of NaOH = (0.175 mol/L) x (0.01500 L) = 0.002625 mol

initial moles of HCOOH = 0.00375 mol

moles of HCOOH remaining after reaction = 0.00375 mol - 0.002625 mol = 0.001125 mol

The concentration of HCOOH at this point is:

[HCOOH] = 0.001125 mol / 0.04500 L = 0.025 M

The Ka expression for formic acid is:

Ka = [H+][HCOO-] / [HCOOH]

We can assume that the [H+] concentration is equal to the [OH-] concentration at this point, since the reaction is at the equivalence point. Therefore:

Ka = (x)(x) / 0.025

where x is the concentration of [OH-].

Solving for x, we get:

x = sqrt(Ka*[HCOOH]) = sqrt(([tex]1.8x10^-4[/tex])*(0.025)) = 0.003794

pOH = -log[OH-] = -log(0.003794) = 2.42

pH = 14.00 - pOH = 11.58

Therefore, the pH after 15.0 mL of 0.175 M NaOH has been added is 11.58.

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On the basis of constructive interference, when two identical pulses go together in a homogeneous medium and the pulses meet and overlap, the maximum displacement of the medium is equal to 6 cm. So, option (c) is right.

Wave interference is the phenomenon where two waves meet while propagating in the same medium. Constructive interference is a form of interference. It takes place when two pulses meet each other and form a larger pulse. The amplitude of the resulting larger pulse is the sum of the amplitudes of the first two pulses.

This could be done at meetings of two crests or troughs. It can appear anywhere between the two interfering waves are displaced upward. But the two negative effects are also seen when they move downwards.This is shown in the image above. Since we have two identical wave pluses, they are close together in a uniform medium.

Now, Amplitude of pluse A = 3 cm

Amplitude of pluse B = 3 cm

So, the pulses meet and are superposed, the amplitude or maximum displacement of the medium is sum of amplitudes of pluses, that is 3cm + 3 cm = 6 cm. Therefore, the displacement value should be 6 cm.

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Complete question:

-The diagram above represents two identical pulses approaching each other in a uniform medium.

As the pulses meet and are superposed, the maximum displacement of the medium is?

a) - 6 cm

b) 0 cm

c)6 cm

d) 3 cm

According to constructive interference, the maximum displacement of the medium when two identical pulses collide and overlap in a homogeneous medium is equal to 6 cm. Option (c) is correct, therefore.

When two waves collide while moving across the same medium, the result is known as wave interference. Interference includes constructive interference. It happens when two pulses collide and create a bigger pulse. The initial two pulses' amplitudes are added to create the larger, resultant pulse.

This could be carried out when two crests or troughs meet. It could show up anywhere where the two competing waves are displaced upward. But when they descend, the two adverse impacts are also evident.In the picture up top, this is evident. In a homogeneous medium, they are close together since we have two identical wave pluses.

The current amplitude of pluse A is 3 cm.

The pluse B's amplitude is 3 cm.

The sum of the plus amplitudes of the pulses, or 3 cm + 3 cm = 6 cm, is the amplitude or maximum displacement of the medium as the pulses collide and superimpose. So, 6 cm should be the displacement value.

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Force pairs that must be equal because they are action/reaction pairs. According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction. This means that action and reaction forces are always equal in magnitude but opposite in direction.

Some examples of action/reaction force pairs include:
1. When you push a book across a table (action), the book pushes back with an equal force (reaction).
2. When a person jumps off a diving board (action), the diving board exerts an equal and opposite force on the person (reaction).
3. A person walking on the ground pushes against the ground (action), and the ground pushes back with an equal force (reaction).

In all these cases, the action/reaction force pairs are equal and opposite, illustrating Newton's Third Law of Motion.

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The magnetic force acting on the charged particle is -0.707 N in the k direction and 0.707 N in the j direction.

In this problem, the charge of the particle is given as 1 C, and the velocity of the particle is 1 m/s at an angle of 45 degrees to the positive x-axis. We can break down the velocity vector into its x and y components as follows:

vx = vcos(45) = 0.707 m/s

vy = vsin(45) = 0.707 m/s

The magnetic field is given as 1 T in the negative x direction.

Substituting these values into the formula for the magnetic force, we get:

F = q * (vxi + vyj + 0k) x (-Bi)

where I, j, and k are the unit vectors in the x, y, and z directions, respectively.

Expanding the cross product, we get:

F = q*(-vxB)k + qvyB*j

Substituting the values for q, vx, vy, and B, we get:

F = (1 C) (-0.707 m/s) (1 T) k + (1 C) (0.707 m/s) *(1 T) *j

Simplifying, we get:

F = -0.707 k + 0.707 j

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The 67 kg person has to run at the speed of  [tex]\sqrt{((2 \times KE) / 67)}[/tex] m/s to have that amount of energy.

To calculate the kinetic energy (KE) of a person running, we can use the formula

KE = [tex]0.5 \times m \times v^2[/tex]

where m is the mass (67 kg) and v is the velocity in meters per second (m/s).

First, we need to determine the desired amount of energy, which is not provided in the question.
Obtain the desired energy value (in joules, J) you want the person to have while running.

Plug the mass (67 kg) and the desired energy value into the KE formula: [tex]KE = 0.5 \times 67 \times v^2[/tex].

Rearrange the formula to isolate v:

[tex]v^2 = (2 \times KE) / 67[/tex] m/s

Calculate v by taking the square root

[tex]v = \sqrt {(2 \times KE) / 67)}[/tex] m/s

The calculated value of v will be the velocity in meters per second (m/s) required for the person to have the desired amount of energy while running.
Remember to replace "KE" with the desired energy value in joules, and you will get the velocity (in m/s) needed for a 67 kg person to have that amount of energy.

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The average magnitude of the Poynting vector at a distance of 4.50 miles from the transmitter is approximately 40.8 nanowatts per square meter.

This problem is about finding the average magnitude of the Poynting vector, which is a measure of the energy flow of electromagnetic waves, at a distance of 4.50 miles from an isotropic radio transmitter.

The transmitter broadcasts equally in all directions with an average power of 200 kW. We can use a formula that relates the power density of the transmitter to the Poynting vector. By substituting the given values and using the speed of light as the propagation velocity of electromagnetic waves, we can calculate the Poynting vector.

The average magnitude of the Poynting vector at a distance of 4.50 miles from the transmitter is approximately 40.8 nanowatts per square meter.

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The angle of incoming light plays a significant role in determining the percentage of light that is transmitted through water versus the percentage of light that is reflected. As the angle of incidence of light increases, the amount of light that is transmitted through the water decreases, while the amount of light that is reflected off the surface of the water increases.

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Sonar can be a useful tool for monitoring the hydrosphere, which includes all of the water on and beneath the Earth's surface.

Sonar works by emitting sound waves that bounce off objects in the water, and then measuring the time it takes for the sound waves to return to the source. By analyzing the echoes, scientists can map the seafloor, measure the depth of the water, and even identify the size and location of marine organisms.

Sonar can also be used to monitor the movements of water masses, including ocean currents, tides, and storm surges. This information is important for understanding global climate patterns and predicting the effects of natural disasters

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Answer:

Intensity

Explanation:

The graph shows different types of radiation!

The red line imples how intense the radiation is. When the line is long and spread out, it implies less intensity. When it moves up and down quickly, as you can see in the end of the graph, it implies high intensity.

We can confirm this by seeing the labels. Indeed, Radio waves are the least powerful, and gamma rays the most.

~~~Harsha~~~

If a plunge pool undercuts the support of the resistant rock layer above and causes it to collapse, then this can result in a potentially dangerous situation, the collapse can cause erosion of the surrounding soil and vegetation, leading to further instability of the area.

The collapse of the resistant rock layer can lead to a landslide or rockfall, which can cause significant damage to the surrounding area and pose a threat to anyone in the vicinity. Additionally, the collapse can cause erosion of the surrounding soil and vegetation, leading to further instability of the area.

To prevent such occurrences, it is important to properly design and maintain plunge pools. The proper design includes ensuring that the pool is not located near a resistant rock layer or if it is, that measures are put in place to prevent the pool from undercutting the rock.

This may include reinforcing the rock layer, installing retaining walls or other support structures, or moving the pool to a different location.

Regular maintenance of the plunge pool is also crucial to prevent erosion and undercutting of the rock layer. This may involve monitoring the pool for signs of erosion or instability and taking corrective action if necessary, such as repairing or reinforcing the surrounding area.

Overall, it is important to ensure that plunge pools are designed and maintained properly to prevent the undercutting of resistant rock layers and potential collapses, which can have serious consequences.

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A 500 N force is applied to a 25m/s2 object. The mass of the object is 20kg. The correct answer is option: A.

The force applied to an object is related to its mass and acceleration through the equation:

F = ma,

where F is the force, m is the mass, and a is the acceleration. Rearranging this equation, we get:

m = F/a.

In the given problem, a force of 500 N is applied to the object, and its acceleration is 25 m/s^2.

Substituting these values in the formula, we get :

m = 500 N / 25 m/s^2 = 20 kg.

Therefore, the mass of the object is 20 kg, which is option A.

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The correct statement about the half-lives of radioactive elements is: The half-lives of radioactive elements vary from fractions of a second to billions of years. Option D

The half-life of a radioactive element is the time it takes for half of a sample of the element to decay into another, more stable form.

Radioactive elements have varying half-lives, depending on their specific isotopes and nuclear properties. These half-lives can range from extremely short durations, such as fractions of a second, to incredibly long periods, like billions of years.

The variation in half-lives reflects the diversity in stability among different isotopes of radioactive elements, which is influenced by factors like the ratio of protons and neutrons in the nucleus.

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The ratio of the energy of a 15.0 nm-wavelength photon to the kinetic energy of a 15.0 nm-wavelength electron is approximately 1.255.

The energy of a photon is given by the equation:

[tex]E_p_h_o_t_o_n[/tex]  = h*c/λ

where h is Planck's constant, c is the speed of light, and λ is the wavelength of the photon.

Substituting the given values, we get:

[tex]E_p_h_o_t_o_n[/tex] = (6.626 x [tex]10^-^3^4[/tex] J s)*(3.00 x [tex]10^8[/tex] m/s)/(15.0 x [tex]10^-^9[/tex] m)

[tex]E_p_h_o_t_o_n[/tex] = 1.325 x [tex]10^-^1^8[/tex] J

The kinetic energy of an electron is given by the equation:

K = (1/2)mv²

where m is the mass of the electron and v is its velocity.

To find the velocity of an electron with a wavelength of 15.0 nm, we can use the de Broglie equation:

λ = h/p = h/(m*v)

where p is the momentum of the electron.

Solving for v, we get:

v = h/(m*λ)

Substituting the given values, we get:

v = (6.626 x [tex]10^-^3^4[/tex] J s)/((9.109 x [tex]10^-^3^1[/tex] kg)*(15.0 x [tex]10^-^9[/tex] m))

v = 4.659 x [tex]10^6[/tex] m/s

Substituting this value into the equation for kinetic energy, we get:

K = (1/2)(9.109 x [tex]10^-^3^1[/tex] kg)(4.659 x [tex]10^6[/tex] m/s)²

K = 1.055 x  [tex]10^-^1^8[/tex] J

Therefore, the ratio of the energy of a 15.0 nm-wavelength photon to the kinetic energy of a 15.0 nm-wavelength electron is:

[tex]E_p_h_o_t_o_n[/tex] /K = (1.325 x  [tex]10^-^1^8[/tex] J)/(1.055 x  [tex]10^-^1^8[/tex] J) = 1.255.

So, the ratio is approximately 1.255.

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The number of times the drops were repeated and the mass of the balloons may be controlled variables that are kept constant during the experiment to isolate the effect of the height of the window on the time it takes for the balloons to reach the ground.

What is Isolated System?

An isolated system is a concept in thermodynamics and physics that refers to a system that does not exchange energy or matter with its surroundings. It is a closed system with respect to both energy and matter, meaning that no energy or matter is transferred across its boundaries. In an isolated system, the total energy, including both kinetic and potential energy, remains constant over time. This is known as the principle of conservation of energy.

The experiment's variable in this case is the height of the window from which the balloons are dropped. The students are specifically testing the effect of gravity, which is influenced by the height from which an object falls. By varying the height of the window, the students are manipulating the independent variable (height of the window) to observe the effect on the dependent variable (time it takes for the balloons to reach the ground).

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To determine the fraction of the wood submerged in water, we need to compare the density of the wood to the density of water.

The density of water is 1.000 g/cm3 at standard temperature and pressure.

If the wood has a density of 0.600 g/cm3, it is less dense than water, which means it will float on water.

To determine the fraction of the wood submerged in water, we can use the following formula:

fraction submerged = (volume submerged) / (total volume)

Since the wood floats on water, the volume of water displaced by the wood is equal to the volume of the submerged portion of the wood.

The total volume of the wood is equal to its mass divided by its density:

total volume = mass / density

We don't have the mass of the wood, but we can use any arbitrary value to determine the fraction submerged.

Let's assume the wood has a mass of 100 g.

total volume = mass / density = 100 g / 0.600 g/cm3 = 166.67 cm3

Now, let's assume that when the wood is submerged in water, it displaces 80 cm3 of water.

fraction submerged = (volume submerged) / (total volume) = 80 cm3 / 166.67 cm3 = 0.48

Therefore, approximately 48% of the wood is submerged in water.

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Answer:

[tex]752.1\; {\rm N}[/tex] from support [tex]\texttt{1}[/tex] ([tex]2.0\; {\rm m}[/tex] from the student.)

[tex]1013.7\; {\rm N}[/tex] from support [tex]\texttt{2}[/tex] ([tex]1.0\; {\rm m}[/tex] from the student.)

(Assuming that [tex]g = 9.81\; {\rm N\cdot kg^{-1}}[/tex], the beam is level with negligible height, and that the density of the beam is uniform.)

Explanation:

Weight of the beam: [tex](100\; {\rm kg})\, (9.81\; {\rm N\cdot kg^{-1}}) = 981\; {\rm N}[/tex].

Weight of the student: [tex](80\; {\rm kg})\, (9.81\; {\rm N\cdot kg^{-1}}) = 784.8\; {\rm N}[/tex].

Assuming that the beam is uniform. The center of mass of the beam will be [tex](1/2)\, (3.0\; {\rm m}) = 1.5\; {\rm m}[/tex] away from each support.

Consider support [tex]\texttt{1}[/tex] as the fulcrum:

Hence:

[tex]\begin{aligned}N_{\texttt{2}}\, (3.0) = (981)\, (1.5) + (784.8) \, (2.0) \end{aligned}[/tex].

[tex]\begin{aligned}N_{\texttt{2}} &= \frac{(981)\, (1.5) + (784.8) \, (2.0)}{3.0} \; {\rm N} = 1013.7\; {\rm N}\end{aligned}[/tex].

In other words, support [tex]\texttt{2}[/tex] would exert an upward force of [tex]1013.7\; {\rm N}[/tex] on the beam.

Similarly, consider support [tex]\texttt{2}[/tex] as the fulcrum:

Hence:

[tex]\begin{aligned}N_{\texttt{1}}\, (3.0) = (981)\, (1.5) + (784.8) \, (1.0) \end{aligned}[/tex].

[tex]\begin{aligned}N_{\texttt{1}} &= \frac{(981)\, (1.5) + (784.8) \, (1.0)}{3.0} \; {\rm N} =752.1\; {\rm N}\end{aligned}[/tex].

In other words, support [tex]\texttt{1}[/tex] would exert an upward force of [tex]752.1\; {\rm N}[/tex] on the beam.

To help you determine the reasonable temperatures for points 1 to 5 in the lower tube, we'll need to consider the given temperature readings in the topmost tube and the temperature changes in the system.

Let's go through the steps to find the temperatures for each point.
Analyze the temperature readings in the topmost tube.
- Observe and record the temperatures at different points in the topmost tube.

Understand the heat transfer process in the system.
- Consider the direction of heat flow, such as from hot to cold regions.

Determine the temperature differences between the tubes.
- Based on the heat transfer process, estimate the temperature differences between the corresponding points in the topmost and lower tubes.

Calculate the temperatures for points 1 to 5 in the lower tube.
- Subtract the estimated temperature differences from the temperatures of the corresponding points in the topmost tube.

By following these steps, you will be able to find the reasonable temperatures for points 1 to 5 in the lower tube based on the given temperature readings in the topmost tube.

*complete question: Given the temperature readings in a topmost tube, which would be reasonable temperatures for points 1 to 5 in the lower tube?

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The highest order that contains the entire visible spectrum is the first order. The visible spectrum is the range of wavelengths of light that are visible to the human eye.

The first order is the smallest wavelength range that contains the entire visible spectrum, which ranges from approximately 400-700 nm.

This is because the visible spectrum is a relatively small range of the electromagnetic spectrum compared to other regions, such as radio waves or X-rays.

When light is diffracted through a diffraction grating, the first order is the most commonly used order as it contains the majority of the visible spectrum.

However, higher orders can also contain parts of the visible spectrum, but they are less commonly used as they contain smaller ranges of wavelengths.

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The two forces on Earth that could change the motion of an object are friction and gravity.

Friction is a force that opposes the motion of an object when it is in contact with another surface. It can cause an object to slow down or come to a stop.

Gravity is a force of attraction between two objects, and it can cause an object to accelerate toward the center of the earth or towards another massive object. The gravitational force on an object depends on its mass and the distance between it and the other object.

Speed and acceleration are not forces, but rather measures of motion. Heat and light are also not forces that can change the motion of an object, but rather forms of energy that can be transferred to an object and affect its temperature or behavior. Direction and time are not forces, but concepts related to an object's motion.

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The orbital period of the Earth around the Sun is determined by its distance from the Sun and its mass. If the Earth had twice its present mass but orbited at the same distance from the Sun, its gravitational attraction to the Sun would be stronger, resulting in a longer orbital period. Using Kepler's third law of planetary motion, we can calculate the new orbital period as follows:

T^2 = (4π^2/G) x (r^3/m)

where T is the orbital period, G is the gravitational constant, r is the distance from the Earth to the Sun, and m is the mass of the Earth.

Plugging in the values, we get:

T^2 = (4π^2/6.6743 x 10^-11) x [(149.6 x 10^6)^3 / (2 x 5.9722 x 10^24)]
T^2 = 1.085 x 10^20
T = √(1.085 x 10^20)
T = 1.09 x 10^10 seconds

Converting this to years, we get:
T = 346 years

Therefore, if the Earth had twice its present mass but orbited at the same distance from the Sun as it does now, its orbital period would be approximately 346 years.

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The rate at which energy is being dissipated as Joule heat in a resistor can be calculated using the formula [tex]P=I^2R[/tex], and after an elapsed time equal to the time constant of the circuit, the power dissipated by the resistor can be given by [tex]P=0.4I^2 \times R[/tex].

The rate at which energy is being dissipated as Joule heat in a resistor is equal to the power dissipated by the resistor, which can be calculated using the formula [tex]P=0.4I^2\times R[/tex], where P is the power dissipated in watts, I is the current flowing through the resistor in amperes, and R is the resistance of the resistor in ohms.

After an elapsed time equal to the time constant of the circuit, the current flowing through the circuit will have reached approximately 63.2% of its maximum value. This is because the time constant of a circuit is equal to the product of the resistance and the capacitance, and it represents the amount of time it takes for the current in the circuit to reach 63.2% of its maximum value.

At this point, the power dissipated by the resistor can be calculated using the formula [tex]P=0.4I^2 \times R[/tex]. Since the current is 63.2% of its maximum value, we can substitute 0.632I for I in the formula. Therefore, the power dissipated by the resistor at this point is:

P = (0.632*I)^2 * R

= [tex]P=0.4I^2 \times R[/tex]

where I is the maximum current that will flow through the circuit, and R is the resistance of the resistor in ohms.

The rate at which energy is being dissipated as Joule heat in the resistor is equal to the power dissipated by the resistor, which is given by the above equation. Therefore, the answer to the question is:

Rate of energy dissipation = [tex]P=0.4I^2 \times R[/tex] watts

where I is the maximum current that will flow through the circuit, and R is the resistance of the resistor in ohms.

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frame of reference that is not inertial. A non-inertial frame is now defined as a frame that accelerates relative to the underlying inertial reference frame. Newton's law won't be valid.

How does the framework function?

Performance could change depending on the lighting. The Frame automatically modifies the Plasma tvs brightness and contrasting settings after analyzing the lighting conditions in the room and the light level of your content.

What distinguishes a system from a frame?

the hard architecture (bones and condyle) that serves as an animal's body's framework. skeletal system, skeleton, and systema skeletale. system: a collection of organs or bodily parts that function or are anatomically related; "the body contains a system for organs for digestion."

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The instantaneous angular velocity is 20.0 s is 400 rad/s.

Since the angular acceleration is constant, we can use the formula:

[tex]θ = 1/2 * α * t^2 + ω0 * t[/tex]

where

[tex]θ = angle rotated = 50 rad[/tex]

[tex]α = angular acceleration[/tex]

[tex]t = time = 5.0 s[/tex]

[tex]ω0 = initial angular velocity = 0 (starting from rest)[/tex]

Solving for α, we get:

[tex]α = 2 * (θ - ω0 * t) / t^2 = 2 * 50 rad / 5.0 s^2 = 20 rad/s^2[/tex]

Now, using the formula:

[tex]ω = α * t + ω0[/tex]

where

ω = instantaneous angular velocity at the end of 20.0 s (what we need to find)

[tex]α = angular acceleration = 20 rad/s^2[/tex]

[tex]t = time = 20.0 s[/tex]

[tex]ω0 = initial angular velocity = 0 (starting from rest)[/tex]

we get:

[tex]ω = 20 rad/s^2 * 20.0 s + 0 = 400 rad/s[/tex]

Therefore, the instantaneous angular velocity of the disk at the end of 20.0 s is 400 rad/s.

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The dog travels 2.1 meters horizontally from the edge of the dock before splashing down.

We know that the distance the dog travels horizontally before splashing down is equal to the product of the time in the air and the horizontal velocity of the dog.

Using the equation: distance = velocity x time

We can first solve for the time in the air.

The initial vertical velocity of the dog is zero, and we can use the equation:

distance = 1/2 x acceleration x time⁻²

to find the time it takes for the dog to fall from the edge of the dock to the water.

Assuming a gravitational acceleration of 9.8 m/s⁻², we get:

distance = 1/2 x 9.8 m/s⁻² x time⁻²

0.91 meters = 4.9 x time⁻²

time = sqrt(0.91 / 4.9) = 0.3 seconds

Now that we know the time in the air, we can find the horizontal distance traveled by the dog before splashing down.

Using the equation:

distance = velocity x time

where velocity is the horizontal velocity of the dog, which we know is 7.0 m/s, we get:

distance = 7.0 m/s x 0.3 s = 2.1 meters

The dog travels 2.1 meters horizontally from the edge of the dock before splashing down.

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The required velocity of the satellite to orbit Earth at a constant distance of 8,000,000 m is 7,905 m/s.

What is Gravity?

Gravity is a force that attracts two bodies with mass towards each other. It is one of the four fundamental forces of nature and is responsible for holding planets in orbit around stars and stars in orbit around galaxies. Gravity is described by Einstein's theory of general relativity, which states that gravity is the result of the curvature of spacetime caused by the presence of mass or energy.

where G is the gravitational constant M is the mass of the Earth  and r is the distance between the satellite and the center of the Earth (8,000,000 m).

First, we need to calculate the gravitational acceleration due to the Earth's gravity at this altitude using the formula:

g = GM/[tex]r^{2}[/tex]

g = (6.67 x 10^-11 N [tex]m^{2}[/tex]/[tex]kg^{2}[/tex]) x (5.97 x [tex]10^{24}[/tex] kg) / (8,000,000 m)^2

g = 6.19 m/[tex]s^{2}[/tex]

The required velocity can be found using:

v = √(GM/r)

v = √[(6.67 x 10^-11 N[tex]m^{2}[/tex]/[tex]kg^{2}[/tex]) x (5.97 x [tex]10^{24}[/tex] kg) / (8,000,000 m)]

v = 7,905 m/s

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