Exam2 - smith (js55595) Exam2 Sharma (20715) 1 This...

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Unformatted text preview: smith (js55595) Exam2 Sharma (20715) 1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Two alpha particles (helium nuclei), each consisting of two protons and two neu- trons, have an electrical potential energy of 6 . 25 10 19 J . Given: k e = 8 . 98755 10 9 N m 2 / C 2 , q p = 1 . 6021 10 19 C , and g = 9 . 8 m / s 2 . What is the distance between these parti- cles at this time? Correct answer: 1 . 47639 10 9 m. Explanation: Let: U electric = 6 . 25 10 19 J , k e = 8 . 98755 10 9 N m 2 / C 2 , q p = 1 . 6021 10 19 C , q = 2 q p = 3 . 2042 10 19 C , and q n = 0 C . q 1 = q 2 = 2 q p + 2 q n = 2 (1 . 6021 10 19 C) + 2 (0 C) = 3 . 2042 10 19 C U electric = k e q 1 q 2 r r = k e q 1 q 2 U electric = k e q 2 1 U electric = (8 . 99 10 9 N m 2 / C 2 ) (3 . 2042 10 19 C) 2 6 . 25 10 19 J = 1 . 47639 10 9 m . 002 10.0 points The compressor on an air conditioner draws 99 A when it starts up. The start-up time is about 0 . 4 s. How much charge passes a cross-sectional area of the circuit in this time?...
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Exam2 - smith (js55595) Exam2 Sharma (20715) 1 This...

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