Work Energy And Power Question 270

Question: A 10 m long iron chain of linear mass density $ 0.8 kg {m^{-1}} $ is hanging freely from a rigid support. If $ g~=10 m{s^{-2}} $ , 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\times 0.8kg = 8kg $

Height of iron chain $ =5m $

$ P=\frac{mgh}{t}=\frac{8\times 10\times 5}{10}W=40w $



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