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HW #6-4-solutions

# HW #6-4-solutions - pasha(sep635 HW 6-4 Antoniewicz(56445...

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pasha (sep635) – HW 6-4 – Antoniewicz – (56445) 1 This print-out should have 11 questions. Multiple-choice 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 Δ U in the system’s potential energy? Correct answer: - 30 J. Explanation: By conservation of energy, we know that Δ E particle + Δ U = 0 , so we can write 30 J + Δ U = 0 Δ 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 Rank-order the locations on the path in terms of the magnitude of the comet’s 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 Rank-order the locations on the path in terms of the comet’s 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 . 004 (part 3 of 5) 2.0 points Consider the system of the comet plus the star. Which of the following statements are correct? List all that apply, separated by commas. If none apply, enter “none”.

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