A showman comes running and stands at the centre of the rotating platform.Considering the platform and the showman a system,which of the following is conserved?
1. Linear momentum
2. Angular momentum
3.kinetice energy
4. None of the above
In the given figure a ball strikes a rod at its end elastically and rod is hinged smoothly at point A. Then which of the statement(s) is/are correct (regarding just before and after the collision)
A child is standing with folded hands at the centre of a platform rotating about its central axis. The kinetic energy of the system is K. The child now stretches his hands so that the moment of inertia of the system doubles. The kinetic energy of the system now is: