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JIPMER 2006

Exam: JIPMER
Year: 2006
Subject: Physics
Chapter: Rotational Motion

JIPMER 2006 · Physics · Rotational Motion

The angular momentum of a rotating body changes from A_0 to 4 A_0...

The angular momentum of a rotating body changes from

A_0

to

4 A_0

in 4 seconds. The torque acting on the body is :

Options

A $3 / 4 A_0$
B $4 A_0$
C $3 A_0$
D $3 / 2 A_0$

Correct answer

A. $3 / 4 A_0$

Step-by-step solution

Torque

\begin{aligned} \tau=\frac{d L}{d t} & =\frac{\left(4 A_0-A_0\right)}{4} \\ & =\frac{3 A_0}{4} .\end{aligned}

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