posted by Anonymous .
8) A rock of mass 400 g is tied to one end of a string that is 2.0 m in length and swung around in a horizontal circle. It takes 2 s to complete one circle.
a. Find the angular velocity of the rock just as the string breaks.
b. At what speed is the rock traveling just as the string breaks?
c. What is the centripetal force swinging the rock.