GENERAL KNOWLEDGE

Detailed explanation-1: -Since the mass decreases, there will also be a decrease in the moment of inertia. If the final moment of inertia is less than the initial moment of inertia, for there to be compensation in angular momentum, it must be necessary to increase the final angular velocity. Therefore the correct answer is a. Increases.

Detailed explanation-2: -As the gymnast lowers his hands, the radius of gyration decreases and hence moment of inertia also decreases. Angular momentum remains conserved and hence angular velocity increases.

Detailed explanation-3: -Now decreasing the Moment of inertia(I)of the rotating body will increase its angular velocity(w)

Detailed explanation-4: -It states that “For a spinning system, there is no change in the angular momentum of the object until and unless an external torque is applied to it.”

Detailed explanation-5: -Conservation of angular momentum is a physical property of a spinning system such that its spin remains constant unless it is acted upon by an external torque; put another way, the speed of rotation is constant as long as net torque is zero.