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Unformatted text preview: pasha (sep635) HW 64 Antoniewicz (56445) 1 This printout should have 11 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 8.0 points Consider an isolated system, by which we mean a system free of external forces. if the sum of the particle energies in the system increases by 30 J, what must have been the change U in the systems potential energy? Correct answer: 30 J. Explanation: By conservation of energy, we know that E particle + U = 0 , so we can write 30 J + U = 0 U = 30 J . 002 (part 1 of 5) 2.0 points The figure below shows the path of a comet orbiting a star. A B C D E Rankorder the locations on the path in terms of the magnitude of the comets mo mentum at each location, starting with the location at which the magnitude of the mo mentum is the largest. 1.  ~ p E  >  ~ p D  >  ~ p C  >  ~ p B  >  ~ p A  correct 2.  ~ p E  =  ~ p D  >  ~ p C  >  ~ p B  =  ~ p A  3.  ~ p A  =  ~ p B  =  ~ p C  =  ~ p D  =  ~ p E  4.  ~ p D  >  ~ p E  >  ~ p C  >  ~ p B  >  ~ p A  5.  ~ p A  >  ~ p B  >  ~ p C  >  ~ p D  >  ~ p E  Explanation: Momentum increases as the comet gets closer to the Sun; therefore  ~ p E  >  ~ p D  >  ~ p C  >  ~ p B  >  ~ p A  . 003 (part 2 of 5) 2.0 points Rankorder the locations on the path in terms of the comets kinetic energy at each location, starting with the location at which the kinetic energy is the largest. 1. K D > K E > K C > K B > K A 2. K A > K B > K C > K D > K E 3. K E > K D > K C > K B > K A correct 4. K E = K D > K C > K B = K A 5. K E = K D = K C = K B = K A Explanation: K increases as  ~ v  increases; therefore, K E > K D > K C > K B > K A ....
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 Fall '08
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