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 α = 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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This note was uploaded on 02/17/2010 for the course YS PHYS taught by Professor Jy during the Spring '10 term at PA Culinary.

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

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