14.93 The combined mass of the motorcycle and rider is 160 kg. The motorcycle starts from...

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14.93 The combined mass of the motorcycle and rider is 160 kg. The motorcycle starts from rest at t = 0 and moves along a circular track with a 400-m radius. The tangential component of accelera- tion of the motorcycle as a function of time is a = 2 + 0.21 m/s. The coefficient of static friction between the tires and the track is 0.8. How long after it starts does the motorcycle reach the limit of adhesion, which means that its tires are on the verge of slip- ping? How fast is the motorcycle moving when that occurs? Strategy: Draw a free-body diagram showing the tangential and normal components of force acting on the motorcycle. sup]] S O P 400 m en et Problem 14.93 14.93 The combined mass of the motorcycle and rider is 160 kg. The motorcycle starts from rest at t = 0 and moves along a circular track with a 400-m radius. The tangential component of accelera- tion of the motorcycle as a function of time is a = 2 + 0.21 m/s. The coefficient of static friction between the tires and the track is 0.8. How long after it starts does the motorcycle reach the limit of adhesion, which means that its tires are on the verge of slip- ping? How fast is the motorcycle moving when that occurs? Strategy: Draw a free-body diagram showing the tangential and normal components of force acting on the motorcycle. sup]] S O P 400 m en et Problem 14.93