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State two conditions when no work is done by a force.
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
Define the term 'work'. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.
In which of the following case the work done by a force will be maximum : when the angle between the direction of force and direction of motion is 0° or 90°?
Is the motion of moon around the earth in circular path an accelerated motion?
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate: the speed of the body.
A water pump raises 50 kg of water through a height of 25 m in 5s. Calculate the power supplied by the pump (Take: g = 10 N kg−1).
