Question

If the external torque acting on a system is zero $(i.e.,\tau =0),$ then

• A. $J=0$
• B. $F=0$
• C. $\omega =0$
• D. $\alpha =0$

Answer 1

Answer: (D)

By the relation $\tau =I\alpha$ if $\tau =0,$ then $\alpha =0$ because moment of inertia of any body cannot be zero.