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Q. A bicycle wheel has an initial angular velocity of 6.8 . After turning through one-half of a revolution, the angular velocity is reduced to 1.8 . If the angular acceleration of the wheel is constant during the motion, how long will it take the wheel to make the one-half revolution?

Q. what force is needed to pull a 150 pound sled along a horizontal surface? The coeficient of kinetic friction is 0.10 and the sled is pulled by a rope that makes an angle of 0 degree with the horizontal. There is no acceleration.

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