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Q: A ball is thrown straight up into the air. At its highest point, which form(s) of energy does it…

A:

Q: Differentiate between work and power.

A: Work and power are two important concepts of mechanics. Both are scalar quantities.

Q: Work is energy transferred by

A: Work is done on an object when energy is transferred to the object whereas work is done by an object…

Q: Can there be a net force on an object and have no work done to it? Defend your answer.

A: let the net force acting on the object be "F"  and displacement of the object due to this force is…

Q: How much force acts on a tossed coin when it is halfway to its maximum height? How much force acts…

A: concept and Explanation -                                                  The net force acting on a…

Q: Does a spring exert the same amount of force regardless of its extension?

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Q: What is the work done lifting a 20kg child from the floor to a height of 2m? (Note that a mass of…

A: Given  Mass(m) = 20 kg  Height (h) = 2 m  Acceleration due to gravity near earth surface (g) = 9.8…

Q: m above

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Q: Show that 50 W of power is required to give a brick 100 J of PE in a time of 2 s.

A: Power = Work done /Time Work Done = Change in Potential Energy = 100 J

Q: How much work is done raising at 3 kg mass 5 meters inthe vertical direction

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Q: Calculate the power if 814 Joules of work gets done in 10 seconds

A: Given Data: Work Done, W = 814 Joules Time, T =10 seconds

Q: Find KE of an elevator when it is loaded with goods to give a mass of 2000kg, and moving at 2 m/s

A: The kinetic energy can be either in a horizontal or vertical motion of a moving body. This is…

Q: What are some energy transfers with a bow and arrow?

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Q: Why is a hydro turbine more efficient than a hydro pump?

A: Hydro turbines and hydro pumps have different functions within the context of hydropower systems,…

Q: Calculate the average power required to raise a 140 kg drum to a height of 15m in 1 minute

A: The potential energy at a height h is P.E=mgh…

Q: If a runner exerts 350 J of work to make 150 W of power, then how long did it take the runner to do…

A:

Q: If A man pushes a lawnmower with a force of 20 pounds a distance of 60 feet down a yard how many…

A: Let F be the constant force (horizontal) applied by man (Amanda) on the lawnmower up to distance d.

Q: Name the form of energy which is wound up watch spring possesses.

A: A wound up watch spring has the potential energy because of its wound up state.

Q: All the units below are units of power except: O Horsepower O Watts O Newtons O Joules per second O…

A: In the given question, We have to discuss about units of power. Then We choose the correct option.

Q: How much force acts on a tossed coin when it is halfway to its maximum height? How much force acts…

A: Answer:-  When the force acts on a tossed coin that has reached halfway its maximum height is 50%.…

Q: Choose the BEST answer to the following: A model car with 3 times as much speed as another has a…

A: Write the expression for kinetic energy.

Q: How much net work must be done to accelerate a 1000 kg 20 m / s to 30 m / s?

A: According to the work energy theorem, the work done must be equal to the change in kinetic energy.…

Q: Why does a three-legged support work better than one with four legs?

A: The main advantages of three-legged support over four legs. Three legs are always in plane while…

Q: Why should the angle of swing be small few degrees), or, what would happen if the angle were large?

A: For oscillation of a bob hanging from a thread from a fixed point as shown in diagram below we have.

Q: Is energy conserved when we move?

A:

Q: What is the efficiency of the machine that miraculously converts all the input energy to useful…

A: GivenInput energy = Output useful energy

Q: Power is expressed by which of the following units?

A: Solution

Q: wath will be the potential energy of 4 Kg height of 12m. [Take g = 10 m/s² ] mass kept art

A: Write the given values with the suitable variables. m=4 kgh=12 mg=10 m/s2 Here, m is the mass, h is…

Q: when we say work is done against a force we mean the force does

A: work is done against the force means that the direction of displacement is opposite to the direction…

Q: anet with a net force of 250 now all work, including the

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Q: Name the physical quantity which is measured in terms of horse power.

A: Watt is the unit of power and Horse power is also a unit of power which is denoted as 'hp' .1…

Q: Calculate the potential energy of a ball having mass of 10 lbs on top os Stinson building at a…

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Q: For a ball thrown up into the air, potential energy is highest right before it contacts the ground?

A: For a ball thrown up into the air, potential energy is highest right before it contacts the ground?

Q: When can energy be transferred from one object to another?

A: Energy is the ability to do work. Energy is a conserved quantity and the law of conservation of…