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A certain ride at an amusement park consists of a hollow cylinder that can rotate at...

A certain ride at an amusement park consists of a hollow cylinder that can rotate at high speeds. The floor can then be dropped with the people staying pinned to the sides of the cylinder. Terry the Mighty Iguana climbs inside the cylinder and the ride operator turns it on. The cylinder has a radius of 6 meters and a coefficient of friction between the cylinder wall and the Terry is u=0.67

a. how much friction is required to keep the 70 kg iguana from falling?

b. what must the normal force be so that the 70 kg iguana will not fall ?

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