Work Energy And Power Question 270

Question: A 10 m long iron chain of linear mass density 0.8kgm1 is hanging freely from a rigid support. If g =10ms2 , then the power required to left the chain up to the point of support in 10 second

Options:

A) 10 W

B) 20 W

C) 30 W

D) 40 W

Show Answer

Answer:

Correct Answer: D

Solution:

[d] m=10×0.8kg=8kg

Height of iron chain =5m

P=mght=8×10×510W=40w



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