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 |
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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 |
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a) |
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b) |
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(b)
From conservation of angular momentum ( = constant), angular velocity will remain half. As,
The rotational kinetic energy will become half.
A slender rod of mass and length
is pivoted about a horizontal axis through one end and released from rest at an angle of 30
above the horizontal. The force exerted by the pivot on the rod are the instant when the rod passes through a horizontal position is
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