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Frad = for a mass, m, rotating at a constant speed, v about a circular path with radius . How does the centripetal force vary with the constant speed? It is proportional to the speed, v. It is proportional to the square of the speed. v2 It is inversely proportional to the speed. Question 4 (2 points) The centripetal force, Frad for a mass, m, rotating at a constant speed, v about a circular path with radius, r. How does the centripetal force vary with the period, T which is the time it takes the mass m to make one complete revolution ? It is proportional to the square of the period, T2. It is inversely proportional to the period. It is proportional to the speed, T. It is inversely proportional to the square of the period