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प्रश्न
Work done by a boy depends on the time in which he does work.
पर्याय
True
False
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उत्तर
False.
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संबंधित प्रश्न
When do we say that work is done?
The S.I. unit of work is
A body, when acted upon by a force of 10 kgf, moves to a distance 0.5 m in the direction of force. Find the work done by the force. Take 1 kgf = 10 N.
A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1.
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.
A uniform circular motion is an accelerated motion. Justify it.
Name the physical quantity whose MKS units are kgm2s-3.
Fill in the boxe to show the corresponding energy transformation.
If a ball is dropped on the sloping roof of a house, it acquires ______ and falls on the ground. That is the transformation of ______ energy into ______ energy takes place.
(kinetic, potential, motion)
