$A$ swimmer curls their body before entering the water so that...

$A$ disc is rotating with an angular speed of $\omega$. If a child sits on it,which of the following is conserved?

$A$ swimmer,while jumping into a river from a height,easily forms a loop in the air if:

$A$ man standing on a turn-table is rotating at a certain angular frequency with his arms outstretched. He suddenly folds his arms. If his moment of inertia with folded arms is $75 \%$ of that with outstretched arms,then his rotational kinetic energy will

The angular momentum of a particle performing circular motion under a central force is constant because of .........

If the value of torque is zero,then