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Figure 7.2b

A 4.6 m massless rod is loosely pinned to a frictionless pivot at 0. A 8.7 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 Figure 7.2b, the tension in the rod when the ball passes through the lowest point at D is closest to:

• 87 N

• 435 N

• 261 N

• 348 N

• 171 N

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