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प्रश्न
When you move upstairs, do you perform some work?
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उत्तर
Yes, we perform work against gravity.
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संबंधित प्रश्न
A weight lifter lifted a load of 200 kgf to a height of 2.5 m in 5 s. Calculate:
- the work done, and
- the power developed by him. Take g = 10 N kg-1
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State two disadvantages of producing hydroelectricity.
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
A person of mass 50 kg climbs a tower of height 72 metres. Calculate the work done. (g = 9.8 m s−2).
P, Q and R are three forces which act as shown in fig.
The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
What do you mean by a kilo joule?
State larger units of power.
