Ch6-H4-solutions - chauhan(mmc2762 – Ch6-H4 – turner...

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Unformatted text preview: chauhan (mmc2762) – Ch6-H4 – turner – (56910) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Given the kinetic energy K and potential en- ergy U of a system, what is the condition necessary for an object in a 1 /r type po- tential energy field to be in a bound state, such as when a satellite orbits a planet or a negatively charged particle orbits a positively charged particle? 1. K − U < 2. K + U + 0 3. K + U > 4. K − U = 0 5. K − U > 6. K + U < correct Explanation: A system in a 1 /r type potential energy field is in a bound state if the sum of its kinetic and potential energy is less than zero, i.e. K + U < 0, because the object does not have sufficient kinetic energy to escape the potential energy field. More generally, if the potential energy function has a well (a region where it is concave up), the system is in a bound state if the total energy is insufficient to escape this well. See Fig. 6.41 on pp. 255 of Matter and Interactions. 002 (part 1 of 5) 10.0 points The figure below shows the path of a comet orbiting a star. b b b b b 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 (part 2 of 5) 10.0 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 E > K D > K C > K B > K A correct 2. K E = K D > K C > K B = K A 3. K A > K B > K C > K D > K E 4. K E = K D = K C = K B = K A 5. K D > K E > K C > K B > K A Explanation: K increases as | vectorv | increases; therefore, K E > K D > K C > K B > K A . chauhan (mmc2762) – Ch6-H4 – turner – (56910) 2 004 (part 3 of 5) 10.0 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”. A. External work must be done on the sys- tem to speed up the comet....
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This note was uploaded on 04/03/2012 for the course PHYSICS 303K taught by Professor Antoniewicz during the Spring '11 term at University of Texas.

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Ch6-H4-solutions - chauhan(mmc2762 – Ch6-H4 – turner...

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