First slide

Torque

Question

The angular momentum of a rotating body changes from A₀to 4A₀ s in 4 sec. The torque acting on the body is :

Easy

A

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

4A₀
C

3A₀
D

$\frac{3}{2} A_{0}$

Solution

$Torque τ = \frac{ΔL}{Δt} = \frac{4 A_{0} - A_{0}}{4} = \frac{3}{4} A_{0}$

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