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# 2-4 - Create assignment 00224 Homework 4 Feb 17 at 10:45 am...

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Unformatted text preview: Create assignment, 00224, Homework 4, Feb 17 at 10:45 am 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. Potential Diff 25:02, highSchool, numeric, > 1 min, normal. 001 The work needed to carry a 1 C charge from point A to point B is 10 J. Calculate the potential difference between point A and B. Correct answer: 10 V. Explanation: Let : q = 1 C and W = 10 J . The work is W = q V V = W q = 10 J 1 C = 10 V . keywords: Proton in Potential Diff 25:05, trigonometry, numeric, > 1 min, nor- mal. 002 Calculate the speed of a proton that is acceler- ated from rest through a potential difference of 120 V. Correct answer: 151622 m / s. Explanation: Let : m p = 1 . 67262 × 10- 27 kg , q = 1 . 60218 × 10- 19 C , and Δ V = 120 V . By conservation of energy Δ K + q Δ V = 0 , 1 2 mv 2 = q Δ V v p = s 2 q Δ V m p = s 2 (1 . 60218 × 10- 19 C) (120 V) 1 . 67262 × 10- 27 kg = 151622 m / s . The only difference in the speed of the pro- ton and the speed of the electron is the differ- ence in their mass. 003 Calculate the speed of an electron that is accelerated through the same potential differ- ence. Correct answer: 6 . 49705 × 10 6 m / s. Explanation: Let : m e = 9 . 10939 × 10- 31 kg . The speed is v e = r 2 q Δ V m e = s 2 (1 . 60218 × 10- 19 C) (120 V) 9 . 10939 × 10- 31 kg = 6 . 49705 × 10 6 m / s . keywords: Three Point Charges 13 25:06, trigonometry, numeric, > 1 min, nor- mal. 004 Three equal charges 2 . 5 μ C are located in the xy-plane, one at (0 m, 45 m), another at (55 m, 0 m), and the third at (65 m,- 35 m)....
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2-4 - Create assignment 00224 Homework 4 Feb 17 at 10:45 am...

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