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10. A body rotating at the angular speed of 20 rad/s slows down to an angular spee seconds. What is the average angular acceleration? 11. A body is rotating with an angular acceleration of 2 rad/s What is the linear acceleration of a point in this body that is 2.1 m from the axis of rotation? 12. Two masses, each of mass M, are separated by a distance D. a) what is the moment of inertia, if the axis of rotation is in the middle of the distance between the masses (D/2 from each mass) and perpendicular to the line connecting the masses? b) what is the moment of inertia if the distance between the masses is increased from D to 3D and the axis of rotation is still in the middle? The distance of each mass from the axis is 1.5 D. 13. The moment of inertia of a collapsing star changes from l to 12 0.2 1,. If the initial speed of rotation was oi, what is the new angular speed of rotation?

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Acco tording to ch cheaa A pliy z 12 S 1212

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