Test #1- PHY 302L

Test #1- PHY 302L - Version 006/AAABC Test #1 Antoniewicz...

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Version 006/AAABC – Test #1 – Antoniewicz – (56495) 1 This print-out should have 14 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points Two spheres, Fastened to “pucks”, are rid- ing on a Frictionless airtrack. Sphere 1 is charged with 2 nC, and sphere 2 is charged with 8 nC. Both objects have the same mass. 1 nC is equal to 1 × 10 9 C. As they repel, 1. they do not accelerate at all, but rather separate at constant velocity. 2. sphere 1 accelerates 4 times as Fast as sphere 2. 3. sphere 1 accelerates 16 times as Fast as sphere 2. 4. sphere 2 accelerates 16 times as Fast as sphere 1. 5. they have the same magnitude oF acceler- ation. correct 6. sphere 2 accelerates 4 times as Fast as sphere 1. Explanation: The Force oF repulsion exerted on each mass is determined by F = 1 4 π ǫ 0 Q 1 Q 2 r 2 = ma where r is the distance between the centers oF the two spheres: b v F 12 b = b v F 21 b . Since both spheres have the same mass and are subject to the same Force, they have the same acceleration. 002 10.0 points The two charges Q are fxed at the vertices oF an equilateral triangle with sides oF length a as shown. a a a Q Q q The work required to move a charge q From the other vertex to the center oF the line join- ing the fxed charges is 1. W = 2 k Qq a correct 2. W = 6 k Qq a 3. W = 3 2 k Qq a 4. W = 0 5. W = 2 2 k Qq a 6. W = 2 k Qq a 7. W = 4 k Qq a 8. W = 3 k Qq a 9. W = k Qq a 10. W = 6 3 k Qq a Explanation: U 1 = + k Qq a + k Qq a = +2 k Qq a U 2 = + k Qq a 2 + k Qq a 2 = +4 k Qq a W = U 2 U 1 = 2 k Qq a . 003 10.0 points The total charge that an automobile battery can supply without being recharged is given
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Version 006/AAABC – Test #1 – Antoniewicz – (56495) 2 in terms of Ampere-hours. A typical 12-V battery has a rating of 65 A · h . Suppose you forget to turn oF the headlights in your parked automobile. If each of the two headlights draws 1 . 8 A , ±nd out the time before your battery is “dead”. 1. 9.5 2. 6.57143 3. 14.0385 4. 11.6667 5. 18.0556 6. 16.1765 7. 14.6875 8. 9.7561 9. 6.71053 10. 14.2 Correct answer: 18 . 0556 h. Explanation:
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This note was uploaded on 10/13/2010 for the course PHY 302l taught by Professor Morrison during the Fall '08 term at University of Texas.

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Test #1- PHY 302L - Version 006/AAABC Test #1 Antoniewicz...

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