8B-Soln01-v1.0.1

8B-Soln01-v1.0.1 - apart]. e) We want ball C to provide a...

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8B Worksheet Answers 1. Charge and Coulomb’s Law 1. a) Both balls will experience the same magnitude of force [Newton’s third law still applies!] b) The balls are identical, and therefore have the same mass. By F = ma , since they experience the same force, they experience the same acceleration. c) Ball A initially feels a force to the left, and will accelerate to the left. As ball A moves away from ball B, the force that it feels will decrease , since the distance separating the charge increases . The acceleration will therefore always be to the left and have a magnitude which will decrease down to zero when the balls are infinitely far apart. d) Ball A starts with zero velocity, but the non-zero acceleration gives it a velocity to the left. As time goes on, the velocity increases, but at a slower and slower rate [the acceleration is decreasing]. As the acceleration drops to zero, the ball will reach a maximum velocity [after an infinite amount of time, when the balls are ‘infinitely’ far
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Unformatted text preview: apart]. e) We want ball C to provide a force to counter ball B’s. Since the force acts to the left, we want the force by C on A to be to the right. A and C have the same sign of charge and will repel. Therefore, you need to place Ball C to the left of A. f) Ball C should be a distance d to the left of Ball A. g) Ball C should be a distance d / 2 to the left of Ball A. h) Ball C should be a distance 3 d to the right of Ball A. 2. a) Both balls will experience the same magnitude of force [Newton’s third law still applies!] b) Ball 1 will be moving faster. It experienced the same force as ball 2, but its lower mass means that the acceleration it felt was greater, and thus achieved a greater velocity. c) F 1 = kQ 1 Q 2 / r 2 = 2.7 N to the right. F 2 = 2.7 N to the left. d) a 1 = F 1 / m 1 = 270 m/s 2 to the right. a 2 = F 2 / m 2 = 67.5 m/s 2 to the left....
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This note was uploaded on 03/10/2012 for the course PHYSICS 8B taught by Professor Shapiro during the Spring '07 term at Berkeley.

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