Energy Conservation With Conservative Forces: A small but dense 2.0-kg stone is attached to one end of a very light rod that is 1.2 m long. The other end of the rod is attached to a frictionless pivot. The rod is raised until it is vertical, with the stone above the pivot. The rod is released and the stone moves in a vertical circle with no air resistance. What is the tension in the rod as the stone moves through the bottom of the circle?
A. 20 N
B. 40 N
C. 60 N
D. 80 N
E. 100 N
Answer: E
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