A ballet dancer is rotating about his own vertical axis. Without external torque if his angular velocity is doubled then his rotational kinetic energy is

A ballet dancer is rotating about his own vertical axis at an angular velocity 100 rpm on smooth horizontal floor. The ballet dancer folds himself close to his axis of rotation by which is moment of inertia decreases to half of initial moment of inertia then his final angular velocity is

A ballet dancer is rotating about his own vertical axis on smooth horizontal floor. I, omega, L, E are moment of inertia, angular velocity, angular momentum, rotational kinetic energy of ballet dancer respectively. If ballet dancer stretches himself away from his axis of rotation, then

A ballot dancer is rotating about hyis own vertical axis on smooth horizontal floor with a time period 0.5 sec . The dancer flods himself close to his axis of rotation due to which his radius of gyration decreases by 20% , then his new time period is

The rotational kinetic energy of a body is E. In the absence of external torque, the mass of the body is halved and its radius of gyration is doubled. Its rotational kinetic energy is

The rotational kinetic energy of a body is E. In the absence of external torque, the mass of the body is halved and its radius of gyration is doubled. Its rotational kinetic energy is

The rotational kinetic energy of a body is E. In the absence of external torque, the mass of the body is halved and its radius of gyration is doubled. Its rotational kinetic energy is

Two identical discs are positioned on a vertical axis as shown in the figure. The bottom disc is rotating at angular velocity omega_(0) and has rotational kinetic energy K_(0) . Change in the rotational kinetic energy of the system is

A horizonral circular plate is rotating about a vertical axis passing through its centre with an angular velocity omega_(0) . A man sitting at the centre having two blocks in his hands stretches out his hands so that the moment of inertia of the system doubles. If the kinetic energy of the system is K intially, its final kinetic energy will be