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Solution
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State the S.I. unit of work and define it.
A machine raises a load of 750 N through a height of 16 m in 5 s. calculate:
- energy spent by machine,
- power at which the machine works.
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.
State the SI unit of work.
Complete the following sentences:
The SI unit of work is ....... and of power is .......
Can work done be zero even if force acts on the body?
Define Translational motion.
State the amount of work done by an object when it moves in a circular path for one complete rotation. Give a reason to justify your answer.
State larger units of power.
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
