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

question 53

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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