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physics 121 exam 2 solutions

# physics 121 exam 2 solutions - Name last first Student ID...

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Name ___________________________________ Student ID Number ____________ last first Physics 121A, Summer 2010 Exam 2, page 1 I. A ball with two strings attached follows the dotted circular path, a horizontal circle of diameter 0 . 74 m. The ball has mass m = 0 . 91 kg, and each string makes a different angle to the vertical as shown. Assume that the motion is uniform circular motion, and ignore air resistance. 1. (4 pts) Which choice best represents unlabeled free body and “ma” diagrams of the ball at the instant shown in the side view above ? Assume a fixed reference point, not moving with the ball. A B C D E 2. (5 pts) Suppose that the tension in the upper string is known to be 36 N. Which choice best represents the magnitude of the tension in the lower string? 38 N 36 N 32 N 15 N zero N A B C D E 50º 35º = = = = =

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