1998MT2s

1998MT2s - Physics 125 Test II October 22, 1998 This is a...

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Physics 125 Test II October 22, 1998 This is a closed book exam. You have 70 minutes to do the exam. You may use a calculator. Where appropriate, draw neat diagrams, labeling your axes and clearly indicating what variables you are using. Use Cartesian coordinates. Give solutions to 2 or 3 significant figures. Grading is based on what appears on your paper. In general, the answer to a problem by itself is not sufficient to obtain credit. The grader should be able to determine, without guessing, the steps you took to arrive at a solution. REGRADES can go either way. That is, errors made in grading do not always reduce your grade; they might have incorrectly increased your grade. (Most requests for regrades yield no change. Usually the student just did not understand how the grade was arrived at.) Please remember to put your name on the test booklet and SIGN THE PLEDGE.
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1. (20 points). Kinetic and Potential Energy a). (5 points) A brick #1, m = 2.0 kg, is dropped to the ground from a height of 10 m. Next, a second brick, #2 with twice the mass, is dropped to the ground from 20 m. What is the ratio of the kinetic energy of the second brick to the first brick, K 2 /K 1 = ? K 1 = mgH K 2 = (2m)g(2H) K 2 /K 1 = 4 b). (5 points) A bottle dropped from a balcony of height H = 10 m strikes the pavement with a speed, s. To double the speed of impact
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This note was uploaded on 05/02/2008 for the course PHYS 125 taught by Professor Mutchler during the Spring '08 term at Rice.

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1998MT2s - Physics 125 Test II October 22, 1998 This is a...

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