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final_s08 - Physics 2 Summer 2008 Final Enter solutions to...

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Physics 2 – Summer 2008 Final Enter solutions to the two problems in the blue book. Each problem is worth 15 points. (2 x 15 = 30). Enter answers to the 14 multiple choice questions in the scantron. The multiple choice questions are worth 70 points, total (30 + 70 = 100) Multiple Choice Question 1 If heat Q is required to increase the temperature of a metal object from 4 o C to 6 o C, the amount of heat necessary to increase the temperature from 6 o C to 12 o C is most likely (a) Q (b) 2Q (c) 3Q (d) 4Q (e) 6Q Multiple Choice Question 2 A solid cylindrical metal rod of diameter D with insulation wrapped around it conducts 50 J/sec of heat from a hot to a cold reservoir. If the diameter of the rod were reduced to ½ D, the heat it would conduct would be (a) 400 J/sec (b) 200 J/sec (c) 100 J/sec (d) 25 J/sec (e) 12.5 J/sec Multiple Choice Question 3 If the rms molecular speed of an ideal gas at an absolute temperature T is v, its rms at absolute temperature 2T is (a) 2 v (b) 2v (c) 2 2 v (d) 4v (e) ½ v Multiple Choice Question 4 A cork of density 0.5 g/cm 3 floats in a swimming pool. The fraction of the cork’s volume that is underwater is approximately (a) 50% (b) 25% (c) 0 (d) 90% (e) 10%
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