A thin cylindrical ring starts from rest at a height h1 = 77 m. The ring has a radius R = 28 cm and a mass M = 3 kg. a)  Write an expression for the ring's initial energy at point 1, assuming that the gravitational potential energy at point 3 is zero.   b)  If the ring rolls (without slipping) all the way to point 2, what is the ring's energy at point 2 in terms of h2 and v2?  c)  Given h2 = 47 m, what is the velocity of the ring at point 2 in m/s?

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.