An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
[2] Work, Energy and Power
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A cricket ball is thrown up from the earth's surface. What happens to its P.E.
(a) during the motion
(b) at the highest point?
[2] Work, Energy and Power
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What is the difference between K.E. and P.E.?
[2] Work, Energy and Power
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Does the total energy of a body always remain constant?
[2] Work, Energy and Power
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Can we destroy every energy associated with a body?
[2] Work, Energy and Power
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Name four different forms of energy.
[2] Work, Energy and Power
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[2] Work, Energy and Power
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Write the S.I. units of power.
[2] Work, Energy and Power
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[2] Work, Energy and Power
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Define the unit 'watt'. How is it related to horse power?
[2] Work, Energy and Power
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A body does 20 J of work in 10 s. What is its power?
[2] Work, Energy and Power
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Name the physical quantity associated with the 'rate of doing work'.
[2] Work, Energy and Power
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An electric motor drives a machine which lifts a mass of 4 kg through a height of 10 m in 5 s at a constant speed. Assuming g = 10 ms-2, calculate
(i) the amount of work done, (ii) the power of the machine.
[2] Work, Energy and Power
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Name the practical unit of power.
[2] Work, Energy and Power
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In what form is energy stored in a wrist watch?
[2] Work, Energy and Power
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A 100 W electric lamp emits energy in the form of light at the rate 10 J per second. What percentage of electric energy does the lamp transform into light energy?
[2] Work, Energy and Power
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A horse exerts a pull on a cart of 300 N so that the horse-cart system moves with a uniform speed 18 km/h on a level road. Calculate the power developed by the horse in watt and also find its equivalent in horse power.
[2] Work, Energy and Power
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If an electric bulb of 100 watt is lighted for 2 hours, how much electric energy would be consumed?
[2] Work, Energy and Power
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A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.
[2] Work, Energy and Power
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Name the physical quantity whose SI unit is Nm.
[2] Work, Energy and Power
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