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Exam 8: Potential Energy and Conservation of Energy

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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?

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Question 61

In the figure,a ball hangs by a very light string.What is the minimum speed of the ball at the bottom of its swing (point B) in order for it to reach point A,which is 1.0 m above the bottom of the swing? In the figure,a ball hangs by a very light string.What is the minimum speed of the ball at the bottom of its swing (point B) in order for it to reach point A,which is 1.0 m above the bottom of the swing?

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