Question

A body loops the loop whose diameter is D. From
what minimum heighth must he start in order to
go around the loop, if the loop is frictionless?​

Answer 1

Explanation:

A little under 25 miles an hour, at least. You need the centripetal force required (mass times the square of speed divided by radius) to be equal to or greater than gravitational force (mass times the acceleration due to gravity (g)). The speed requires varies with the square root of the radius.

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