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# 9-m massless rod is loosely pinned to a frictionless pivot at 0.

A 5.9-m massless rod is loosely pinned to a frictionless pivot at 0. A 6.1-kg ball is attached to the other end of the rod. The ball is held at A, where the rod makes a 30 angle above the horizontal, and is released. The ball-rod assembly then swings freely in a vertical circle between A and B. In Fig. 7.1a, the ball passes through C, where the rod makes an angle of 30 below the horizontal. The speed of the ball as it passes through C is closest to:
14.1 m/s
9.7 m/s
12.1 m/s
8.5 m/s
10.8 m/s

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======== A 5.9-m massless rod is loosely pinned to a frictionless pivot at 0. A 6.1-kg ball
is attached to the other end of the rod. The...

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