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Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 9 - Rotational Dynamics > A boy stands over the centre of a horizontal platform which is rotating freely with a speed of 2 revolutions/s about a vertical axis through the centre of the platform and straight up through the boy. He holds 2kg masses in each of his hands close to his body. The combined moment of inertia of the system is 1kgm^2 . The boy now stretches his arms so as to hold the masses far from his body. In this situation, the moment of inertia of the system increases to 2kgm^2 . The kinetic energy of the system in the latter case as compared with that in the previous case will

A boy stands over the centre of a horizontal platform which is rotating freely with a speed of 2 revolutions/s about a vertical axis through the centre of the platform and straight up through the boy. He holds 2kg masses in each of his hands close to his body. The combined moment of inertia of the system is 1kgm^2 . The boy now stretches his arms so as to hold the masses far from his body. In this situation, the moment of inertia of the system increases to 2kgm^2 . The kinetic energy of the system in the latter case as compared with that in the previous case will

A solid sphere rolls down two different inclined planes of the same height but of different inclinations