5 - Copy (2)

5 - Copy (2) - Version 079/ABADD inclasstest 03 turner...

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Unformatted text preview: Version 079/ABADD inclasstest 03 turner (56705) 1 This print-out should have 2 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points An electron moves at 1 . 2 10 6 m / s into a uniform electric field of magnitude 1341 N / C. The charge on an electron is 1 . 60218 10- 19 C and the mass of an electron is 9 . 10939 10- 31 kg . The field is parallel to the electrons velocity and acts to decelerate the electron. How far does the electron travel before it is brought to rest? 1. 12.38 2. 2.99638 3. 3.97087 4. 3.66202 5. 5.42791 6. 0.646094 7. 8.24118 8. 4.65188 9. 4.54335 10. 0.305269 Correct answer: 0 . 305269 cm. Explanation: Let : v = 1 . 2 10 6 m / s , q e = 1 . 60218 10- 19 C , m = 9 . 10939 10- 31 kg , and E = 1341 N / C . The kinetic energy K = 1 2 mv 2 is depleted by the amount of work done by the electric force F = q e E on the particle: W = integraldisplay F dx = F x = q e...
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5 - Copy (2) - Version 079/ABADD inclasstest 03 turner...

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