A cord is wound round |RIGID BODY DYNAMICS|JEE-MAIN - 2021

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JEE MAIN 2021

26.02.2021_S2

Question

A cord is wound round the circumference of wheel of radius $r$. The axis of the wheel is horizontal and the moment of inertia about it is I . A weight mg is attached to the cord at the end. The weight falls from rest. After falling through a distance ' h ', the square of angular velocity of wheel will be

Select the correct option:

A

$\frac{2 m g h}{I+2 m r^2}$

B

$\frac{2 m g h}{I+m r^2}$

C

2 gh

D

$\frac{2 g h}{I+m r^2}$

✓ Correct! Well done.

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Solution

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