A constant torque acting on a uniform circular wheel changes... | Physics | SolveeIt | Solveeit

Today, August 18

Question

A constant torque acting on a uniform circular wheel changes its angular momentum from $A _{0}$ to $4 A _{0}$ in $4 \,s$ . The magnitude of this torque is

A

$\frac{3 A_{0}}{4}$

B

$A_{0}$

C

$4A_{0}$

D

$121A_{0}$

Answer

$\frac{3 A_{0}}{4}$

Explanation

Solution

Change in angular momentum $=4 A_{0}-A_{0}$ $\Delta L=3 A_{0}$ Torque, $\tau=\frac{\Delta L}{\Delta t}$ $\tau=\frac{3 A_{0}}{4}$