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Unformatted text preview: dzifanu (sd26397) HW 1 opyrchal (121102) 1 This printout should have 8 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points A plastic rod is rubbed against a wool shirt, thereby acquiring a charge of 4 . 9 C. The charge on an electron is 1 . 6 10 19 C. How many electrons are transferred from the wool shirt to the plastic rod? Correct answer: 3 . 0625 10 13 . Explanation: Let : q = 4 . 9 C = 4 . 9 10 6 C and e = 1 . 6 10 19 C . The total charge is q = n e e n e = q e = 4 . 9 10 6 C 1 . 6 10 19 C = 3 . 0625 10 13 . 002 10.0 points A particle of mass 40 g and charge 63 C is released from rest when it is 67 cm from a second particle of charge 12 C. Determine the magnitude of the initial ac celeration of the 40 g particle. Correct answer: 378 . 4 m / s 2 . Explanation: Let : m = 40 g , q = 63 C = 6 . 3 10 5 C , d = 67 cm = 0 . 67 m , Q = 12 C = 1 . 2 10 5 C , and k e = 8 . 9875 10 9 . The force exerted on the particle is F = k e  q 1  q 2  r 2 = m a bardbl vectora bardbl = k e bardbl vectorq bardblbardbl vector Q bardbl m d 2 = k e vextendsingle vextendsingle 6 . 3 10 5 C vextendsingle vextendsingle vextendsingle vextendsingle 1 . 2 10 5 C vextendsingle vextendsingle (0 . 04 kg) (0 . 67 m 2 ) = 378 . 4 m / s 2 . 003 10.0 points A particle with charge 5 C is located on the xaxis at the point 6 cm , and a second particle with charge 4 C is placed on the xaxis at 8 cm . The Coulomb constant is 8 . 9875 10 9 N m 2 / C 2 . 2 4 6 8 10 2 4 6 8 10 5 C 4 C 8 C x (cm) What is the magnitude of the total elec trostatic force on a third particle with charge 8 C placed on the xaxis at 2 cm ? Correct answer: 144 . 799 N. Explanation: Let : q 1 = 5 C = 5 10 6 C , q 2 = 4 C = 4 10 6 C , q 3 = 8 C = 8 10 6 C , x 1 = 6 cm = 0 . 06 m , x 2 = 8 cm = 0 . 08 m , and x 3 = 2 cm = 0 . 02 m ....
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 Spring '09
 PRODAN
 Physics, Charge

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