A popular circus act features daredevil motorcycle riders encased in the “Globe of Death” (Fig. P5.65), a spherical metal cage of diameter 16 ft. (a) A rider of mass 65 kg on a 125-cc (95-kg) motorcycle keeps his bike horizontal as he rides around the “equator” of the globe. What coefficient of friction is needed between his tire and the cage to keep him in place? (b) How many loops will the rider make per second? (c) The same rider performs vertical loops in the globe. What force does the cage need to withstand at the top and the bottom of the rider’s loop? Assume a speed of 20 mi/h for both tricks.
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