A boy on a 1.9 kg skateboard initially at rest
tosses a(n) 8.0 kg jug of water in the forward
direction.
If the jug has a speed of 2.7 m/s relative to
the ground and the boy and skateboard move
in the opposite direction at 0.65 m/s, find the
boy’s mass.
Answer in units of kg.

Answers

Answer 1

Answer:

Approximately [tex]31.3\; {\rm kg}[/tex]. (Assuming the friction between the skateboard and the ground is negligible.)

Explanation:

The momentum [tex]p[/tex] of an object of [tex]m[/tex] and velocity [tex]v[/tex] is:

[tex]p = m\, v[/tex].

When the boy tossed the jug of water, the change in the momentum of the jug would be:

[tex]\Delta p(\text{jug}) = m(\text{jug}) \, (v(\text{jug}) - u(\text{jug}))[/tex], where:

[tex]m(\text{jug}) = 8.0\; {\rm kg}[/tex] is the mass of the jug;[tex]v(\text{jug}) = 2.7\; {\rm m\cdot s^{-1}}[/tex] is the velocity of the jug after the toss;[tex]u(\text{jug}) = 0\; {\rm m\cdot s^{-1}}[/tex] is the initial velocity of the jug, which was at rest before the toss.

Hence:

[tex]\begin{aligned}\Delta p(\text{jug}) &= m(\text{jug}) \, (v(\text{jug}) - u(\text{jug})) \\ &= (8.0)\, (2.7 - 0)\; {\rm kg\cdot m\cdot s^{-1}} \\ &= 21.6\; {\rm kg\cdot m\cdot s^{-1}}\end{aligned}[/tex].

Similarly, the change in the momentum of the skateboard would be:

[tex]\Delta p(\text{board}) = m(\text{board}) \, (v(\text{board}) - u(\text{board}))[/tex], where:

[tex]m(\text{board}) = 1.9\; {\rm kg}[/tex] is the mass of the board;[tex]v(\text{board}) =(-0.65)\; {\rm m\cdot s^{-1}}[/tex] is the velocity of the board after the toss;[tex]u(\text{board}) = 0\; {\rm m\cdot s^{-1}}[/tex] is the initial velocity of the board.

Note that the velocity of the board [tex]v(\text{board})\![/tex] after the toss is opposite to that of the jug. The sign of [tex]v(\text{board})[/tex] would be opposite to that of [tex]v(\text{jug})[/tex]. Since [tex]v(\text{jug})\![/tex] is positive, the value of [tex]v(\text{board})\!\![/tex] should be negative.

[tex]\begin{aligned}\Delta p(\text{board}) &= m(\text{board}) \, (v(\text{board}) - u(\text{board})) \\ &= (1.9)\, ((-0.65)- 0)\; {\rm kg\cdot m\cdot s^{-1}} \\ &= (-1.235)\; {\rm kg\cdot m\cdot s^{-1}}\end{aligned}[/tex].

Let [tex]m(\text{boy})[/tex] denote the mass of the boy. The velocity of the boy was initially [tex]u(\text{boy}) = 0\; {\rm m\cdot s^{-1}}[/tex] and would become [tex]v(\text{boy}) =(-0.65)\; {\rm m\cdot s^{-1}}[/tex] after the toss. The change in the velocity of the boy would be:

[tex]\Delta p(\text{boy}) = m(\text{boy}) \, (v(\text{boy}) - u(\text{boy}))[/tex].

Under the assumptions, the total changes in the momentum of this system (the boy, the skateboard, and the jug) should be [tex]0[/tex]. Thus:

[tex]\Delta p(\text{boy}) + \Delta p(\text{boy}) + \Delta p(\text{jug}) = 0[/tex].

Rearrange and solve for the mass of the boy:

[tex]\Delta p(\text{boy}) = -\Delta p(\text{jug}) - \Delta p(\text{board})[/tex].

[tex]\begin{aligned} m(\text{boy}) &= \frac{-\Delta p(\text{jug}) - \Delta p(\text{board})}{v(\text{boy}) - u(\text{boy})} \\ &= \frac{-(21.6) - (-1.235)}{(-0.65) - 0}\; {\rm kg} \\ &\approx 31.3\; {\rm kg}\end{aligned}[/tex].


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The phenomenon in which an object appears to be different when viewed from different angles is known as a lenticular image. Lenticular printing is the process of producing these images.

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Lenticular printing is a method of producing a lenticular image, which is a printed image that shifts as the viewing angle changes. Lenticular printing is a method of generating a composite image by interlacing two or more images using a lenticular lens.

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The correct option is C. Both a particle and a wave accurately describe what light is. This is known as the wave-particle duality of light

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Complete Question: -

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if you turn on your car headlights during the day, the road ahead of you doesn't appear to get brighter. why not?

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If you turn on your car headlights during the day, the road ahead of you doesn't appear to get brighter.

This is because, during the day, the brightness from the sun overwhelms any additional light that would be provided by the headlights. When you turn on your headlights, they produce light that is visible, but during the day, the sun is brighter than the headlights, so the light from the headlights is not sufficient to make the road appear brighter. Besides, the headlights are designed to enhance vision in low-light conditions. As such, they aren't very useful during the day. Additionally, it's important to keep in mind that in some jurisdictions, driving with your headlights on during the day is illegal, so it's important to check your local laws before doing so.

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if the moon enters its waxing crescent phase tonight, then what lunar phase will you see in approximately two weeks? multiple choice question.

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If the moon enters its waxing crescent phase tonight, then you will see the First Quarter lunar phase in approximately two weeks.

What is the lunar phase?

The Moon is in a specific position during a lunar phase. During the lunar phase cycle, it passes through four primary phases: the new moon, the first quarter, the full moon, and the last quarter. In the new moon phase, the Moon is between the Sun and Earth, and the side of the Moon visible to us is dark.

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which of the following are irreversible thermodynamic processes? check all that apply. which of the following are irreversible thermodynamic processes?check all that apply. the slow and adiabatic expansion of a gas the spontaneous flow of heat from a hot body to a cooler body the conversion of work to heat by friction the free expansion of a gas

Answers

Answer:

Explanation:

The irreversible thermodynamic processes are:

The conversion of work to heat by friction

The free expansion of a gas

The slow and adiabatic expansion of a gas is a reversible process, while the spontaneous flow of heat from a hot body to a cooler body is a natural, irreversible process, but it is not a thermodynamic process per se.

a solenoid has 21 turns per centimeter of its length. the solenoid is twisted into a circle so that it becomes shaped like a toroid. what is the magnetic field at the center of each turn of the toroid? the current is 15

Answers

The magnetic field at the center of each turn of the toroid is 1.5 x 10^-5 T.

To find the magnetic field at the center of each turn of the toroid, we need to use the formula for the magnetic field inside a toroid,

B = (μ * n * I) / (2πr)

where, B is the magnetic field, μ is the permeability of free space, n is the number of turns per unit length, which is 21 turns/cm,

I is the current, which is 15 A

r is the radius of the toroid.

Circumference of the toroid,

C = 2πr = (number of turns per unit length) * length of solenoid

The length of the solenoid is not given, so let's assume it is 1 meter. Then, the circumference of the toroid is,

C = (21 turns/cm) * (100 cm/m) * (1 m) = 2100 turns

So, the radius of the toroid is,

r = C / (2π) = 2100 turns / (2π) = 1050 / π turns

The magnetic field at the center of each turn of the toroid,

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B = 1.5 x 10^-5 T

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if the ball is in contact with the floor for 0.0300 seconds, what is the average force (in n) the floor exerts on the ball?

Answers

When the ball is in contact with the floor for 0.0300 seconds, the average force (in N) the floor exerts on the ball is 0 N. F = (Δp) / Δt

where Δp is the change in momentum of the ball and Δt is the time interval during which the change in momentum occurred.

Δp = mvf - mvi

where mvf is the final velocity of the ball and mvi is the initial velocity of the ball.

In this case, the ball is dropped from a certain height and comes to rest on the ground. This means that its initial velocity (mvi) is zero.

Hence:Δp = mvf - mvi

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The momentum is conserved in the vertical direction, which means that the final momentum (mvf) of the ball after bouncing is equal in magnitude but opposite in direction to its initial momentum.

Hence: mvf = - mvi

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Substituting the above expression for mvf into the equation for the average force:

F = (- m * v0) / Δt

where Δt = 0.0300 seconds is the time interval during which the change in momentum occurred.

F = (- m * v0) / Δt

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Therefore, the average force (in N) the floor exerts on the ball is 0 N.

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Which of Newton's laws explains why your hands get red when you press them hard against a wall?
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Newton's law of gravity
O B.
Newton's first law of motion
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Newton's second law of motion
O D.
Newton's third law of motion

Answers

the answer is newton’s third law of motion.

Explain why the transverse pulse traveling on a rope held by two people reflects in the opposite orientation each time it reaches a person.
Drag the terms on the left to the appropriate blanks on the right to complete the sentences. ANSWER: - greater - oppose - second law - increase - smaller - the same
- third law - first law
When a transverse wave pulse reaches a fixed end of the rope, the displacement of the rope end exerts a force on the object that is keeping the end fixed (in this case, a person). By Newton's ___ the person must exert a force of __ magnitude in ___ direction; otherwise the end of the rope would not remain stationary but would the opposite accelerate in the direction of the force due to the wave disturbance. Because this force acts to ___ the force of the incoming wave pulse, it initiates an outgoing wave pulse that is inverted with respect to the incoming wave pulse.

Answers

To complete the given sentences explaining why the transverse pulse traveling on a rope held by two people reflects in the opposite orientation each time it reaches a person order of the words used is third law, the same, oppose, increase.

When a transverse wave pulse reaches a fixed end of the rope, the displacement of the rope end exerts a force on the object that is keeping the end fixed (in this case, a person). By Newton's third law, the person must exert a force of the same magnitude in oppose direction; otherwise, the end of the rope would not remain stationary but would accelerate in the direction of the force due to the wave disturbance. Because this force acts to increase the force of the incoming wave pulse, it initiates an outgoing wave pulse that is inverted with respect to the incoming wave pulse.

When a transverse pulse traveling on a rope held by two people reaches one of the people, the pulse is reflected in the opposite orientation. This happens because of the interaction between the pulse and the person holding the rope.

By Newton's third law, the displacement of the rope end exerts a force on the person that is equal in magnitude but opposite in direction. If the person did not exert an equal and opposite force, the end of the rope would not remain stationary but would instead accelerate in the direction of the force due to the wave disturbance.

The force exerted by the person opposes the force of the incoming wave pulse, initiating an outgoing wave pulse that is inverted with respect to the incoming wave pulse. This happens due to the conservation of energy and momentum, which are described by Newton's first and second laws. The outgoing pulse has a smaller amplitude than the incoming pulse because some energy is lost in the reflection process.

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if the gravitational force between two objects is 300 n and the mass of one object is 20.0 kg, while the other object is 30 kg, what is the distance between the objects?

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The gravitational force between two objects is 300 N and the mass of one object is 20.0 kg, while the other object is 30 kg, we have to calculate the distance between the objects the distance is  3.67 m.

What is the distance between the objects?

The formula for calculating gravitational force between two objects is given by F = G × m₁ × m₂ / r²

where, F = gravitational force between two objects, m₁ = mass of object 1, m₂ = mass of object 2, r = distance between the objects, G = gravitational constant G = 6.67 × 10⁻¹¹ N·m²/kg².

Now, we can use the above formula to calculate the distance between the objects. F = 300 N, m₁ = 20.0 kg, m₂ = 30 kg, G = 6.67 × 10⁻¹¹N·m²/kg². We have to find

r = ?, F = Gm₁m₂/ r²

r = 6.67 × 10⁻¹¹ × 20 × 30/ 300

r = 3.67m

Therefore, the distance between the objects is 3.67 meters.

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if you have an unmarked bar magnet and an identical unmagnetized bar of iron, how can you determine which is the magnet?

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Iron that is not magnetic will be drawn to a bar magnet. An atom is like a current loop, if it is not observed than it is a magnet.

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Charges that are in motion within an atom produce electricity. The atoms can act as an equivalent current loop thanks to their rotational orbits. Iron is nevertheless drawn to magnetic fields despite their being no current.

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4. what is the name of the region where the most common type of comets, long period comets, come from, and how many of these objects exist?

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The region where most long period comets originate is known as the Oort Cloud. The Oort Cloud is a vast spherical region surrounding the Sun located roughly halfway between the orbits of Neptune and Proxima Centauri. It is estimated to contain up to two trillion icy objects, which are leftovers from the formation of the solar system. Long period comets, which take longer than 200 years to orbit the Sun, originate from the Oort Cloud and make their way towards the inner solar system. They are usually only visible when they come close enough to the Sun to be warmed and shed dust and gas, which form the visible tail of the comet. As they come closer to the Sun, the gravitational attraction of the planets often deflects their orbits and causes them to return to the Oort Cloud for millions of years before repeating the cycle.

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a planet of mass 4 x 10^14 kg is orbiting a parent star 548 km away. if the star is 83 times the mass of the planet, what speed must the planet have to keep a perfectly circular orbit around the star?

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helppp pleaseeee enough points

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The resistance of the copper wire of length 4 m and diameter 0.002 m is 2.25×10⁻² ohms.

What is resistance?

Resistance is the opposition to the flow of current in a circuit.

To calculate the reistance of the copper wire, we use the formula below.

Formula:

R = 4ρL/πd².................. Equation 1

Where:

R = Resistance of the copper wireρ = Resistivity of the copper wire at 20°CL = Length of the copper wired = diameter of the copper wireπ =  constant called Pie

From the question,

Given:

d = 0.002 mL = 4 mρ = 1.77×10⁻⁸ ohm-metreπ = 3.14

Substitute these values into equation 1

R = (4×4×1.77×10⁻⁸)/(3.14×0.002²)R = 2.25×10⁻² ohms

Hence, the resistance of the copper wire is 2.25×10⁻² ohms.

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What Enlightenment idea is represented by the headline

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The headline "Enlightenment ideas of freedom, equality, and justice for all" represents the idea of the Enlightenment that human beings are rational, capable of determining right from wrong, and deserving of rights and freedoms, such as freedom of speech, freedom of religion, and equality before the law.

These ideas were a major factor in the shift away from absolute monarchies, and towards governments of the people, by the people, and for the people. The Enlightenment period also saw the development of democracy and of the rule of law, where the government is subject to a set of laws, rather than relying on the whims of the ruler. Enlightenment thinkers sought to empower the individual, giving people the freedom to think and act as they pleased, rather than relying on the decisions of rulers.

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a new block of mass m is used. this block is made of a material that makes an elastic collision with the rod when the block and rod collide. will the hiehgt h increase, decrease, or stay the same?

Answers

The height h will stay the same when a new block of mass m is used and makes an elastic collision.

Thus, the correct answer is to stay the same.

What is an elastic collision?

An elastic collision is a type of collision in which the total kinetic energy of two or more bodies involved in the collision is conserved. In this collision, the colliding bodies return to their initial state before the collision. That is, the total momentum and kinetic energy are conserved.

As a result, the initial and final energies of the system remain the same, implying that the height of the rod will stay the same as before. So, the height h will stay the same.

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a rod undergoes a change in temperature. the change in length is: a rod undergoes a change in temperature. the change in length is:

Answers

It is a linear expansion, when a rod undergoes a change in temperature and there is a change in its length.

The length that a rod changes to as a result of a temperature change relies on the rod's initial length, the rate of temperature change, and the material's coefficient of linear expansion. The formula for linear expansion is:

ΔL = αL₀ΔT

Where ΔL is the change in length of the object, is the coefficient for linear expansion of the material in question, and L₀ is the initial length of the object.

Volumetric expansion refers to change in one dimension (volume), whereas linear expansion refers to change in one dimension (length) (volumetric expansion). The area thermal expansion coefficient connects a material's area changes to temperature changes.

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Complete question is:

A rod undergoes a change in temperature. the change in length is:

A. linear expansion

B. volumetric expansion

the intensity of the sound of a television commercial is 10 times greater than the intensity of the television program it follows. by how many decibels does the loudness increase?

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The television commercial loudness increases by 10 decibels.

Increase in the Intensity of sound

The decibel (dB) scale is a logarithmic measure of sound intensity. The intensity of a sound is measured in watts per square meter and the decibel scale is a way to express the relative loudness of a sound, compared to a reference level.

A 10 dB increase in intensity is a 10-fold increase in sound power. This means that a sound with an intensity of 10 watts per square meter is 10 times louder than a sound with an intensity of 1 watt per square meter.

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what is not an economical operation of a vehicle? applying the brakes smoothly starting the car quickly obeying the speed limit checking for maintenance regularly

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The option that is not an economical operation of a vehicle is starting the car quickly. Starting the car quickly will reduce fuel economy, as the engine has to work harder to accelerate the car quickly.

Obeying the speed limit is the most economical way to operate a vehicle, as driving at higher speeds requires more fuel. Checking for maintenance regularly is important for the overall efficiency of a vehicle, as preventive maintenance and timely repairs can keep a vehicle running optimally. Applying the brakes smoothly and obeying the speed limit are both considered economical operations of a vehicle because they can help save fuel and reduce wear and tear on the vehicle, resulting in long-term cost savings.

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in uniform circular motion, which of the following quantities are constant? check all that apply. in uniform circular motion, which of the following quantities are constant?check all that apply. speed the magnitude of the net force centripetal acceleration instantaneous velocity

Answers

In a uniform circular motion, the speed, the magnitude of the net force, centripetal acceleration, and instantaneous velocity are all constant.

The motion of an object traveling along a circular path with a constant speed is known as uniform circular motion.

Speed: The speed of an object in uniform circular motion remains constant as the object moves in a circular path.

The magnitude of Net Force: In a uniform circular motion, an object is experiencing a net force towards the center of the circle. This net force is usually referred to as the centripetal force. The magnitude of the centripetal force is always constant in a uniform circular motion.

Centripetal Acceleration: Centripetal acceleration is the rate of change of velocity of an object in uniform circular motion. This acceleration is always constant, and can be calculated using the equation a = v²/r, where v is the speed of the object and r is the radius of the circle.

Instantaneous Velocity: Instantaneous velocity is the velocity of an object at a specific point in time. Since an object in uniform circular motion moves at a constant speed, the instantaneous velocity is also constant.

Therefore, in a uniform circular motion, all the given quantities are constant.

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if it takes 1 joule of work to move an object a distance of 1 meter with a force of 1 newton in 10 seconds, what should we expect about the amount of work required to move the same object the same distance but in 10 years

Answers

The amount of work required to move the same object the same distance but in 10 years will be the same as before is 1 Joule.

It is known that Work = Force x Distance. So, if it takes 1 Joule of work to move an object a distance of 1 meter with a force of 1 Newton in 10 seconds, we can find the force applied on the object.

The formula for force is:

F = m x a, where m is mass and a is acceleration

F = ma1 N = 1 kg x a

Thus, a = 1 m/s².

Now, we have:

F = 1 N, a = 1 m/s² and d = 1 m.

Putting all values in the formula for work done, we have:

W = F x d

W = 1 N x 1 m

W = 1 J

Thus, the work done to move the object is 1 Joule.

Now, if the object moves the same distance but in 10 years, it would make no difference to the work done. This is because work is calculated using force and distance only, and time does not matter here. Therefore, we can expect the same amount of work required to move the object the same distance.

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Why a liquid needs a container when a solid does not?

Answers

The correct option is B, a liquid needs a container when a solid does not Solids have definite shapes, and liquids fill their containers.

Solids are one of the three fundamental states of matter, along with liquids and gases. In a solid, the molecules are tightly packed together, and the substance maintains a fixed shape and volume. The particles in a solid are held together by strong intermolecular forces, which prevent them from moving freely.

Solids have many properties that distinguish them from other states of matter. For example, they are usually denser and more rigid than liquids and gases. Solids can also be classified into different types based on their internal structure, such as crystalline solids, which have a regular and repeating pattern of atoms, and amorphous solids, which lack a definite long-range structure.

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Complete Question: -

Which best describes why a liquid needs a container when a solid does not?

A. Solids fill their containers, and liquids have definite shapes.

B. Solids have definite shapes, and liquids fill their containers.

C. Solids particles do not expand to fill their containers, and liquid particles do.

D. Solids particles expand to fill their containers, and liquid particles do not.

2. The cylinder moves at this velocity all the way around the circular path. Yet when we view the side to side motion, the cylinder does not appear to move with a constant velocity. At which location during the side-to-side motion does the cylinder appear to have the minimum side-to-side velocity?
3. At which location during the side-to-side motion does the cylinder appear to have the maximum side-to-side speed

Answers

The minimum side-to-side velocity is at the top and bottom points, while the maximum side-to-side speed is at the left and right points of the circular path.

The cylinder moves at a constant velocity around the circular path, but its side-to-side motion does not appear to have a constant velocity due to the circular motion.

1. The minimum side-to-side velocity occurs when the cylinder is at the top and bottom points of the circular path. At these points, the cylinder's motion is primarily vertical, causing the side-to-side motion to appear slower.

2. The maximum side-to-side speed occurs when the cylinder is at the left and right points of the circular path. At these points, the cylinder's motion is primarily horizontal, causing the side-to-side motion to appear faster.

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one cycle of the power dissipated by a resistor ( ) is given by this periodic signal repeats in both directions of time. what is the amplitude of the pwm voltage signal applied across the 500- resistor

Answers

The maximum amplitude of the PWM voltage signal applied across the 500-ohm resistor is: Vmax=2*I*R=500*I

The power dissipated by a resistor during one cycle is given by the periodic signal. The PWM voltage signal applied across a 500 Ω resistor is analyzed in this question. The amplitude of the signal is determined below.

Pulse Width Modulation is the PWM. It's a process for varying the pulse width of a square wave, which changes the percentage of time the signal is high to low. The pulse width can be varied to create the desired output signal level. It is frequently utilized in applications where analog signals are required, including control systems, power supplies, and audio systems. The maximum voltage Vm of the PWM voltage signal can be found by calculating the RMS value of the pulse. The root-mean-square value is the square root of the mean of the square of the signal over a given period. If we use a pulse that has a duty cycle of 50%, this formula simplifies to: Vmax=Vm+0.5Vdc where Vdc is the average value of the pulse.

The maximum amplitude can be determined using this formula: Vmax=I*R where I is the current and R is the resistance. The current flowing through the resistor is proportional to the voltage applied to it, and the voltage is proportional to the duty cycle of the PWM signal, which varies from 0 to 1. Thus, the voltage applied to the resistor is proportional to the duty cycle and can be expressed as: V=Vmax*D where D is the duty cycle. Thus, the amplitude of the PWM voltage signal applied across a 500-ohm resistor is: Vmax=2*I*R=500*I. Using this equation, we can determine the maximum amplitude of the PWM voltage signal applied across the 500-ohm resistor.

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how hard must she pull downward to raise herself slowly at constant speed? the mass of the person plus the bucket is 77 kg .

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The person must pull downward with a force equal to her weight, which is approximately 760 N in order to raise herself slowly at a constant speed.

When the person pulls downward on the bucket, there are two forces acting on the system: the force of gravity pulling the person and the bucket down, and the force of the person pulling the bucket up. In order for the person to raise herself at a constant speed, the force she exerts on the bucket must be equal and opposite to the force of gravity pulling her down.

The force of gravity on the person and the bucket is equal to their combined weight, which can be calculated as mass times gravitational acceleration (77 kg x 9.81 m/s^2 = 755.37 N). Therefore, the person must exert a force equal to her weight (approximately 760 N) in order to counteract the force of gravity and raise herself at a constant speed.

Thus, to lift herself up slowly and steadily, the person needs to exert a downward force that is equivalent to her weight, which is around 760 Newtons.

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a series circuit is a current divider and a parallel circuit is a voltage divider circuit. select one: a. true b. false

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The given statement " A series circuit is a current divider and a parallel circuit is a voltage divider circuit " is True

In a series circuit, the electric current is the same through each component, and the total current is equal to the sum of the currents through each component. Therefore, the current is divided among the components.

In a parallel circuit, the potential voltage across each component is the same, and the total voltage is equal to the sum of the voltages across each component. Therefore, the voltage is divided among the components.

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a physics student wants to construct a model of an electric motor. The student creates a chart for the steps in the process. the chart shows what the student recorded so far:
what is the correct ordering of these cards to model how an electric motor works?

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An electric motor is a device that transforms electrical energy into mechanical energy. Most electric motors create force in the form of torque imparted to the motor's shaft by interacting between the magnetic field of the motor and electric current in a wire winding.

How does an electric motor work?

Electric motors generate motion by transferring electrical energy to mechanical energy. The interaction of a magnetic field and winding alternating (AC) or direct (DC) current generates force within the motor.

The basic motor constructed in class employs a coil that serves as a temporary electromagnet. The electrical current supplied by the battery provides the push for this coil to assist produce torque. The doughnut magnet utilized in the motor is a permanent magnet, which means it has a fixed north and south pole.

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what normal force does a horizontal table exert on a 3.5 kg book that sits at rest? be sure to draw a diagram.

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The normal force (F⃗n) exerted by the horizontal table on the 3.5 kg book that sits at rest is equal to the weight (mg) of the book is 34.335 N.

The weight of the book is equal to 3.5 kg * 9.8 m/s2 = 34.3 N.
Therefore, the normal force (F⃗n) of the table on the book is equal to 34.3 N.
The normal force that a horizontal table exerts on a 3.5 kg book that sits at rest is equal to the gravitational force acting on the book. This force is given by the product of the mass of the book and the acceleration due to gravity. Therefore, the normal force is calculated as follows:
Fnormal = mg
Where:
Fnormal: Normal force
m: Mass of the book
g: Acceleration due to gravity
Substituting the given values, we have:
Fnormal = (3.5 kg)(9.81 m/s²)
Fnormal = 34.335 N
Therefore, the normal force exerted by the table on the book is 34.335 N.

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what is the acceleration on a body that approached the arth and comes within 6 earth radii of the earth's surface

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The acceleration on a body that approaches the Earth and comes within 6 Earth radii of the Earth's surface is known as the "gravitational acceleration."

This is caused by the gravitational pull of the Earth, which increases as the body approaches the Earth's surface. The acceleration is given by the equation a = GM/r², where G is the gravitational constant, M is the mass of the Earth, and r is the distance from the center of the Earth. For a body that comes within 6 Earth radii of the Earth's surface, the acceleration would be equal to GM/36, where G is the gravitational constant and M is the mass of the Earth. This acceleration can be used to calculate the velocity of the body and its trajectory around the Earth.

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a net force of 89.0 n propels a 4.00-kg model rocket. after being launched from rest, how fast is the rocket traveling after 2.00 s? enter the numerical value in si units.

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A net force of 89.0 n propels a 4.00-kg model rocket. after being launched from the rest,  the rocket will be traveling at: a velocity of 44.5 m/s.

The net force of 89.0 N propels a 4.00-kg model rocket. After being launched from rest, the rocket will have an acceleration of 89.0 N/4.00-kg = 22.25 m/s².

After 2.00 seconds, the rocket's velocity will be 2.00s x 22.25m/s² = 44.5 m/s. Therefore, after 2.00 s, the rocket will be traveling at a velocity of 44.5 m/s.


To calculate this, we first need to know the net force of the rocket. This is equal to the thrust of the rocket (F = ma) multiplied by the mass of the rocket (m = 4.00 kg). We can then use this net force to calculate the acceleration of the rocket, which is equal to  

F/m = 89.0 N/4.00 kg = 22.25 m/s².


Now that we know the acceleration of the rocket, we can use this to calculate the velocity of the rocket after 2.00 s. To do this, we multiply the acceleration by the time, which in this case is 2.00 s. This gives us an initial velocity of 2.00s x 22.25m/s² = 44.5m/s.  

This means that after 2.00 s, the rocket will be traveling at a velocity of 44.5 m/s.

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