What must happen to a sound making object for it to make sound? A: it must be made of metal
B: it must be in a vacuum
C: it must have force applied to it
D: it must be bent

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n