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Physics
Complete the following sentences:
Joule is the unit of .......
Chapter: [2] Work, Energy and Power
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Complete the following sentences:
1 H.P. = ........ W.
Chapter: [2] Work, Energy and Power
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A weight lifted a load of 200 kgf to a height of 2.5 m in 5 s. calculate: (i) the work done, and (ii) the power developed by him. Take g= 10 N kg-1.
Chapter: [2] Work, Energy and Power
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A boy of mass m climbs up a staircase of vertical height h.
- What is the work done by the boy against the force of gravity?
- What would have been the work done if he uses a lift in climbing the same vertical height?
Chapter: [2] Work, Energy and Power
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Can work done be zero even if force acts on the body?
Chapter: [2] Work, Energy and Power
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What is the relation between 1 H.P. and 1 kW?
Chapter: [2] Work, Energy and Power
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It takes 20 s for A to climb up the stairs, while B does the same in 15 s. compare the (i) work done, and (ii) power developed by A and B.
Chapter: [2] Work, Energy and Power
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Write the SI and CGS units of power. How are they related?
Chapter: [2] Work, Energy and Power
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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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