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13 & 14
013 10.0 points An aerobatic airplane pilot experiences weightlessness as she passes over the top of a loop-the-loop maneuver. The acceleration of gravity is 9.8 m/s2 If her speed is 450 m/s at this time, find the radius of the loop. Answer in units of km 014 10.0 points To test the performance of its tires, a car travels along a perfectly flat (no banking) cir- cular track of radius 87.7 m. The car increases its speed at uniform rate of , 2 at = 3.77 m/s dt until the tires start to skid. If the tires start to skid when the car reaches a speed of 15.4 m/s, what is the coefficient of static friction between the tires and the road?
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