When a coil spring is compressed, the work is done on the spring. The elastic potential energy .....

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Important Questions on Work, Power and Energy

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98000

joule of energy was spent to raise a mass of

80

kg. The mass was raised to a height of _____.

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"Energy can neither be created nor be destroyed", which law is this?

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One kilowatt hour is unit of _____.

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A porter lifts the luggage weighing

5 k g

from the ground and puts on the head. Then, he stands still for some time. How much work he is doing while holding the luggage on his head and standing still?

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When a body falls freely, _____.

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A body having mass

2 k g

is dropped from a height

10 m

. When it reaches on earth, its kinetic energy will be?(

g = 9.8 m / s

HARD

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A body of 2 kg is moving on a smooth horizontal surface with a velocity of 10 m/s in the east direction. A constant force of 10 N is acting on the body in the north direction; after 2 seconds the final velocity will be:

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A heater coil connected to a supply of a 220 V is dissipating some power $ P_1 $ . The coil is cut into half and the two halves are connected in parallel. The heater now dissipates a power $ P_2 $. Find the ratio of power $ P_1 $ : $ P_2 $.

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