11. A disc of diameter 0.4 m and of mass 5 kg is rotating about its axis at the rate of 28 rev/second. Find
(1) angular momentum and (ii) rotational kinetic energy of the disc.
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Explanation:
A ring of diameter 0.4 m and of mass 10 kg is rotating about its axis at the rate of 1200 rpm. The angular momentum of the ring is. =10×(0.2)2×2×227×20=50.28kg-m2s-2.
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