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A machine raises a load of 750 N through a height of 16 m in 5s. calculate:
(i) work done by machine,
(ii) power at which the machine works.
Chapter: [2] Work, Energy and Power
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Name the physical quantity whose MKS units are kgm2s-3.
Chapter: [2] Work, Energy and Power
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Define kinetic energy.
Chapter: [2] Work, Energy and Power
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Give two examples of kinetic energy.
Chapter: [2] Work, Energy and Power
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Name the physical quantity which is equal to the energy of a body.
Chapter: [2] Work, Energy and Power
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Name the physical quantity which is associated with the work done by a body.
Chapter: [2] Work, Energy and Power
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Is kinetic energy a scalar or a vector physical quantity?
Chapter: [2] Work, Energy and Power
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If the speed of a body is doubled, what happens to its kinetic energy?
Chapter: [2] Work, Energy and Power
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What are the physical parameters on which the kinetic energy of a body depends?
Chapter: [2] Work, Energy and Power
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Can a body possess zero kinetic energy?
Chapter: [2] Work, Energy and Power
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Name the type of energy possessed by a moving bullet.
Chapter: [2] Work, Energy and Power
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A body of mass 2 kg is moving with a speed of 20 ms-1. What is its K.E.?
Chapter: [2] Work, Energy and Power
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A moving object of mass 30 kg has 60 J of kinetic energy. What is its speed?
Chapter: [2] Work, Energy and Power
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What type of energy is possessed by a flowing water?
Chapter: [2] Work, Energy and Power
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If the speed of a particle is increased four times, how will its kinetic energy be affected?
Chapter: [2] Work, Energy and Power
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A body is thrown vertically upwards. Its velocity keeps on changing. What happens to its K.E. when does its velocity become zero?
Chapter: [2] Work, Energy and Power
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What change should be effected in the velocity of a body to maintain the same K.E., if its mass is increased four times?
Chapter: [2] Work, Energy and Power
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The K.E. of a body is 5 J. What will be its K.E. when its speed is doubled?
Chapter: [2] Work, Energy and Power
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Name the parameters that can change the K.E.
Chapter: [2] Work, Energy and Power
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Give an example of a body possessing no K.E.
Chapter: [2] Work, Energy and Power
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