16.A coin placed on a rotating turntable just slips if it is placed at a distance of 4 cm from the center. If the angular velocity of the turntable is doubled, it will just slip at a distance of

17.Radius of gyration of a body about an axis at a distance of 6 cm from its centre of mass is 10 cm, The radius of gyration about a parallel axis through its centre of mass is

18.If the angular momentum of a body increases by 50%, its kinetic energy of rotation increases by

19.A child stands at the centre of a turn table with his two arms outstretched. The turntable is set rotating with an angular speed of 40 rev/min. Now, the child folds his hands back and thereby reduces his moment of inertia to 2 / 5 times the initial value. The new kinetic energy of rotation. The value of x is

20.The moment of inertia of uniform circular disc about a diameter is I. Its moment of inertia about an axis perpendicular to its plane and passing through a point on its rim will be