Question

A uniform disc of mass M and radius R is released from the shown position. PQ is a string, OP is a horizontal line, O is the centre of the disc and distance OP is R/2 . Then tension in the string just after the disc is released will be:

• A. $\frac{Mg}{2}$
• B. $\frac{Mg}{3}$
• C. $\frac{2Mg}{3}$
• D. None of these

Answer 1

The correct option is C

$\frac{2Mg}{3}$

Let a is the cceleration of center of mass & α is the angular acceleration of body about center of mass. Applying Newton's law on centre of mass O