EXAM_2_–_Fall2011_Practice[1]

66 x 1027 kg a 161 x 1011 j b 956 x 1013 j c 1082

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Unformatted text preview: ­120 nucleus when it is far from the other one. (1u = 1 atomic mass unit = 1.66 x 10 ­27 kg) A) 1.61 x 10 ­11 J B) 9.56 x 10 ­13 J C) 10.82 x 1012 J D) 5.67 x 10 ­12 J E) 3.22 x 10 ­11 J Problem2. When a falling object reaches terminal speed, its kinetic energy reaches a constant value. However, the gravitational potential energy of the system consisting of the object, Earth and atmosphere continues to decrease. Which of the following best describes why this is not a violation of the conservation of energy for the system consisting of the object plus the Earth? A) The air increases in temperature due to internal work done on the air molecules, W. B) The small number of nuclear decays within the object decreases the rest mass of the falling object. C) The chemical energy of the object increases in order to compensat...
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This document was uploaded on 03/25/2014 for the course PHYS 172 at Purdue University-West Lafayette.

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