Answer:
(i) The relation between torque and angular
acceleration is \[\tau =I\alpha \]when \[\tau =0,\,\alpha =0\]
\[\therefore \]Angular acceleration cannot change.
(ii) The relation between torque and angular momentum is \[\tau
=\frac{dL}{dt}\]
When \[\tau =0,\,\,\frac{dL}{dt}=0\]or \[L=cons\tan
t\]
\[\therefore \]Angular momentum of the body does not change
when torque is zero.
(iii) As \[L=I\omega =cons\tan t\], when \[\tau =0\],
therefore, angular speed \[(\omega )\]will change if moment of inertia (I)
changes.
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