# quiz4 - UCSD Physics 2A Fall 2009 Instructor Vivek Sharma...

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UCSD Physics 2A Fall 2009 Instructor : Vivek Sharma Quiz Four INSTRUCTIONS: Enter your name and code # in the bottom strip of the first page. Return the entire set of exam sheets with your scantron . Use a #2 pencil to fill your scantron. Write your code number and bubble it in under ““EXAM NUMBER””. Bubble in the quiz version (see letter A -- D at bottom of page) in your scantron under ““ EXAM VERSION””. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. FIGURE B 1) In Fig. B, the block of mass m is at rest on an inclined plane that makes an angle θ with the horizontal. The force of static friction f must be such that A) f > mg. B) f > mg sin θ . C) f = mg sin θ . D) f > mg cos θ . E) f = mg cos θ . 2) A tight - rope walker walks across a 30.0 m long wire tied between two poles. The center of the wire is displaced vertically downward by 1.0 m when he is half - way across. If the tension in both halves of the wire at this point is 4161 N, what is the mass of the tight - rope walker? Neglect the mass of the wire.

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quiz4 - UCSD Physics 2A Fall 2009 Instructor Vivek Sharma...

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