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A physics major is working to pay his college tuition by performing in a travelling carnival. He rides a motorcycle inside a hollow transparent...

A physics major is working to pay his college tuition by performing in a travelling carnival. He rides a motorcycle inside a hollow transparent plastic sphere. After gaining sufficient speed, he travels in a vertical circle with a radius of 13 meters. The physics major has a mass 70 kilograms, and his motorcycle has a mass 40 kilograms. (a) What minimum speed must he have at the top of the circle if the tires of the motorcycle are not to lose contact with the sphere? (b) At the bottom of the circle, his speed is twice the value calculated in part (a). What is the magnitude of the normal force exerted on the motorcycle by the sphere at this point?

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