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A racetrack has the shape of an inverted cone, as the drawing shows. On this surface the cars race in circles that are parallel to

A racetrack has the shape of an inverted cone, as the drawing shows. On this surface the cars race in circles that are parallel to the ground. For a speed of 30.9 m/s, at what value of the distance d should a driver locate his car if he wishes to stay on a circular path without depending on friction?

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