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HW-Ch11 - HW-CH11 9th Edition CH11 Problems 46 60 79 85 8th...

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HW-CH11 9th Edition CH11 Problems: 46, 60, 79, 85 8th Edition CH11 Problems: 48, 58, 75, 93 46. The rotational inertia of a collapsing spinning star drops to 1 3 its initial value. What is the ratio of the new rotational kinetic energy to the initial rotational kinetic energy? 60. In Fig. 11-54, a 1.0 g bullet is °red into a 0.50 kg block attached to the end of a 0.60 m nonuniform rod of mass 0.50kg. The block-rod-bullet system then rotates in the plane of the °gure, about a °xed axis at A. The rotational inertia of the rod alone about that A is 0.060 kg ° m 2 . Treat the block as a particle. (a) What then is the rotational inertia of the block-rod-bullet system about point A? (b) If the angular speed of the system about A just after impact is 4.5 rad/s, what is the bullet±s speed
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