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Q. A frictionless pulley has the shape of a uniform solid disk of mass 6.00 kg and radius 24.0 cm. A 1.50 kg stone is attached to a very light wire that is wrapped around the rim of the pulley , and the stone is released from rest. As it falls down, the wire unwinds without stretching or slipping, causing the pulley to rotate. How far must the stone fall so that the pulley has 6.50 J of kinetic energy?

Q. Sasha's favorite ride at the fair is the Ferris wheel that has a radius of 7 m. a) If the ride takes 20 s to make one full revolution, what is the linear speed of the wheel? b) What centripetal force will the ride exert on Sasha's 50 kg body? c) Does Sasha feel as if she is being pulled in or out by the ride? d) Explain the difference between what she feels and what is really happening at the top and bottom of the wheel.

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