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 . The child stretches his arms so that the moment of inertia of the system doubles. The kinetic energy of the system now is |
|||||||
a) |
b) |
c) |
d) |
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 . The child stretches his arms so that the moment of inertia of the system doubles. The kinetic energy of the system now is |
|||||||
a) |
b) |
c) |
d) |
(b)
From conservation of angular momentum ( = constant), angular velocity will remain half. As,
The rotational kinetic energy will become half.