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A ball of mass $m$ is moved in a vertical circle of radius $r$ as shown in the figure below. The tension in the string is varied so that it always keeps the ball moving in a perfect circle as the ball changes speed, because it is rising and falling in the Earth's gravitational field.​

John Krehbiel. Created for Copyright 2016. All rights reserved.

What is the difference in the tension in the string at the bottom of the circle vs. the top?











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