A boy stands on a freely rotating platform with his arms extended. His rotation speed is 0.3 rev/s, when he draws in, his speed increases to 0.5 rev/s, then the ratio of his moment of inertia in these two cases will be

A person is standing on a rotating platform, with his arms at his sides. If he stretches his arms, then which of the following statements is correct?

A man stands on a rotating platform with his arms stretched holding a 5 kg weight in each hand. The angular speed of the platform is 1.2 rev s^-1 . The moment of inertia of the man together with the platform may be taken to be constant and equal to 6 kg m^2 . If the man brings his arms close to his chest with the distance n each weight from the axis changing from 100 cm to 20 cm . The new angular speed of the platform is.

A man stands on a rotating platform with his arms stretched holding a 5 kg weight in each hand. The angular speed of the platform is 1.2 rev s^-1 . The moment of inertia of the man together with the platform may be taken to be constant and equal to 6 kg m^2 . If the man brings his arms close to his chest with the distance n each weight from the axis changing from 100 cm to 20 cm . The new angular speed of the platform is.

A person standing on a rotating platform with his hands lowered, outstretches his arms. The angular momentum of the person

A boy is standing on a platform which is free to rotate about its axis. the boys holds an open umbrella in his hand. The axis of the umbrella coincides with tht of the platform. The moment of inertias of the platform plus the boy sytem is 3.0xx10^-3 kg-m^ and that of the umbrella is 2.0xx10^-3 kg-m^2 . The boy starts spinning the umbrella about the axis at an angular speed of 2 rev s1 with respect to himself . Find the angular velocity imparted to the platform.

A man standing on a frictionless rotating platform rotates at 1 rps, his arms are outstretched and he holds a weight in his hands. In this position, the total moment of inertia of the system is 6 kg m^2 , he leaves the weights, the moment of inertia decreases to 2kg m^2 . The resulting angular speed of the platform is

A perso is standing on a rotating platform wit his arms outstretched.Suddelny,he folds his hands near to his body.which of the following is correct?

A man stands on a rotating platform, with his arms stretched horizontally holding a 5 kg weight in each hand. The angular speed of the platform is 30 revolutions per minute. The man then brings his arms close to his body with the distance of each weight from the axis changing from 90cm to 20cm. The moment of inertia of the man together with the platform may be taken to be constant and equal to 7.6 kg m^2 :- What is his new angular speed? (Neglect friction.)

A boy is standing on a platform which is free to rotate about its axis. The boy holds an open umbrella in his hand. The axis of the umbrella coincides with tht of the platform. The moment of inertias of the platform plus the boy sytem is 3.0xx10^-3 kg-m^ and that of the umbrella is 2.0xx10^-3 kg-m^2 . The boy starts spinning the umbrella ils 2.0xx10^-3 kg-m^2 . and that the umbrella is 2.0xx10^-3kg-m^2 . The boy starts of 2.0 rev/s with repsect to himself. Find the angular velocity imparted to the platform.