If a man lifts a load up with the help of a rope such that it raises the load of mass 50kg
to a height of 20m in 100 sec. Find the power of man
(class 9 science chapter work and energy extra question)
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Answer:
Given :
Mass (m) = 50 Kg
Height (H) 20 m
Time (T) = 100 second
To Find :
Power of the man
Solution :
Work done in unit time is called power.
Power = \frac{Work Done(W)}{Time(T)}
Time(T)
WorkDone(W)
Work Done (W) = Force × Displacement
= Mass × Acceleration due to gravity × Displacement
= 50 × 10 × 20
= 10000 J
∴ Power of the man (P) = \frac{Work Done (W)}{Time Taken (T)}
TimeTaken(T)
WorkDone(W)
={10000}{100} = 100 W
Hence, the power of man is 100 W.
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