Question
A constant torque acting on a uniform circular wheel changes its angular momentum from $A_0$ to $4 A_0$ in $4$ seconds. The magnitude of this torque is ...........
✓
Answer
(a)
$\tau=\frac{\Delta L}{\Delta t}$
$\tau=\frac{4 A_0-A_0}{4}=\frac{3 A_0}{4}$
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