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HW 6-4-solutions

# HW 6-4-solutions - madrid(tmm2353 HW 6-4 Antoniewicz(56445...

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madrid (tmm2353) – 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 8.0points 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 40 J, what must have been the change Δ U in the system’s potential energy? Correct answer: - 40 J. Explanation: By conservation of energy, we know that Δ E particle + Δ U = 0 , so we can write 40 J + Δ U = 0 Δ U = - 40 J . 002(part1of5)2.0points 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. | vectorp A | = | vectorp B | = | vectorp C | = | vectorp D | = | vectorp E | 2. | vectorp E | > | vectorp D | > | vectorp C | > | vectorp B | > | vectorp A | correct 3. | vectorp D | > | vectorp E | > | vectorp C | > | vectorp B | > | vectorp A | 4. | vectorp E | = | vectorp D | > | vectorp C | > | vectorp B | = | vectorp A | 5. | vectorp A | > | vectorp B | > | vectorp C | > | vectorp D | > | vectorp E | Explanation: Momentum increases as the comet gets closer to the Sun; therefore | vectorp E | > | vectorp D | > | vectorp C | > | vectorp B | > | vectorp A | . 003(part2of5)2.0points 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 E = K D = K C = K B = K A 2. K E >K D >K C >K B >K A correct 3. K E = K D >K C >K B = K A 4. K D >K E >K C >K B >K A 5. K A >K B >K C >K D >K E Explanation: K increases as | vectorv | increases; therefore, K E >K D >K C >K B >K A .

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