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संबंधित प्रश्न
When does a force do work?
State and define the S.I. unit of work.
kWh is the unit of ______.
A boy weighing 350 N climbs up 30 steps, each 20 cm high in 1 minute, Calculate:
- the work done and
- power spent.
A man spends 7.4 KJ energy in displacing a body by 74 m in the direction in which he applies force in 2.5 s. Calculate the force applied.
A body is provided at a point. A force of 20 N is applied at a distance of 40 cm from the pivot. Find the moment of force about the pivot.
In the following case write yes, if the work is being done and no if no work is being done.
A man trying to push a wall.
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A person climbs a ladder.
A man raises a box of mass 50 kg to a height of 2 m in 20 s, while another man raises the same box to the same height in 50 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1
