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8. A pendulum consists of a sphere of 5.00-kg mass attached to a light cord of length L. The
sphere is released from rest at point (A) when the cord makes an 30-degree angle with the
vertical, and the pivot at P is frictionless. The speed of the sphere when it is at the lowest
point (B) is 1.62 m/s. Find the length of the cord.
L cós A
P
1
8A
L
T
A
mg

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