An 80-M Massless Rod Is Loosely Pinned to a Frictionless Pivot

question 2

Multiple Choice

An 8.0-m massless rod is loosely pinned to a frictionless pivot at 0, as shown in the figure. A very small 4.0-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 with negligible friction in a vertical circle between A and B. The tension in the rod when the ball passes through the lowest point at D is closest to

• A) 160 N.
• B) 200 N.
• C) 120 N.
• D) 80 N.
• E) 40 N.

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