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# solution36 - cherubin(mcc2645 QUIZ 1 Electrostatics...

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cherubin (mcc2645) – QUIZ 1 Electrostatics – Catala – (12054) 1 This print-out should have 5 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points An electron is accelerated by a constant elec- tric field of magnitude 258 N / C. Find the magnitude of the acceleration of the electron. Correct answer: 4 . 53178 × 10 13 m / s 2 . Explanation: Let : E = 258 N / C , q e = 1 . 6 × 10 - 19 C , and m e = 9 . 109 × 10 - 31 kg . The net force is q E = m a a = | q e | E m e = ( 1 . 6 × 10 - 19 C ) (258 N / C) 9 . 109 × 10 - 31 kg = 4 . 53178 × 10 13 m / s 2 . 002 (part 2 of 2) 10.0 points Find the electron’s speed after 6 . 34 × 10 - 8 s, assuming it starts from rest. Correct answer: 2 . 87315 × 10 6 m / s. Explanation: Let : Δ t = 6 . 34 × 10 - 8 s . The final velocity is v f = a Δ t since v i = 0 m / s, so v f = ( 4 . 53178 × 10 13 m / s 2 ) ( 6 . 34 × 10 - 8 s ) = 2 . 87315 × 10 6 m / s . 003 10.0 points Suppose that 0 . 44 g of hydrogen is separated into electrons and protons. Suppose also that the protons are placed at the Earth’s North Pole and the electrons are placed at the South Pole.

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solution36 - cherubin(mcc2645 QUIZ 1 Electrostatics...

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