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प्रश्न
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
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उत्तर
Yes.
संबंधित प्रश्न
A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of the force. What should be the value of θ to get the maximum positive work?
Work done by a boy depends on the time in which he does work.
The S.I. unit of energy is .............
A boy of mass 40 kg climbs up the stairs and reaches the roof at a height 8 m in 5 s. Calculate:
- the force of gravity acting on the boy,
- the work done by him against the force of gravity,
- the power spent by boy. (Take g = 10 m s-2)
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
What do you mean by a kilo joule?
A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate: the speed of the body.
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
