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Unformatted text preview: (iv) the angular velocity of the disc after 15 s. (v) the angular momentum of the disc after 15 s. (vi) the kinetic energy of the disc after 15 s. (vii) the angle that the disc turns in 15 s. (viii) show that the work done is the same as the kinetic energy. 4. A figure skater increases her rotation rate from 1 rev every two seconds to 2 rev.s1 . If her initial moment of inertia was 4.6 kg.m 2 , what is her final moment of inertia? How is the change accomplished? 5. A man stands with his hands on his sides on a platform that is rotating at 2.5 rev.s1 . If the man now raises his hands to a horizontal position, the speed of rotation decreases to 1.7 rev.s1 . (i) What is the reason for this change? (ii) By what factor has the moment of inertia of the person changed?...
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 Fall '10
 George
 Physics, Friction, Mass, Work

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