QTest #8-solutions - Correct answer: 9 . 702 10 8 W....

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Version 046/AACDC – QTest #8 – Antoniewicz – (56445) 1 This print-out should have 3 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points AFo rce F oF magnitude 2 x 3 is applied to stop a particle moving with an initial velocity v 0 .Th epa r t i c l et rav e l sF rom x =0to x = D in coming to a stop aFter the Force F is applied. The work done by F is 1. 1 2 D 4 2. D 4 3. - D 4 4. 1 2 D 3 5. - D 3 6. - 1 2 D 4 correct 7. - 1 2 D 3 8. 2 D 3 Explanation: Because the Force is to stop the particle, it’s opposite to the particle’s motion direction, i.e., the Force is negative. ±rom the defnition oF work, W = Z F d s = Z D 0 - 2 x 3 d x = - 1 2 D 4 002 10.0 points Water ²ows over a section oF Niagara ±alls at arateoF1 . 5 × 10 6 kg / sandFa lls66m . The acceleration oF gravity is 9 . 8m
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Unformatted text preview: Correct answer: 9 . 702 10 8 W. Explanation: P = W t = mg h t = g h = (1 . 5 10 6 kg / s) (9 . 8 m / s 2 ) (66 m) = 9 . 702 10 8 W 003 10.0 points The fgure shows a potential energy curve For the interaction oF a two atom system. The horizontal line represents a bound state with constant K+U value. What is the minimum amount oF energy (in units oF eV) which must be supplied to cause the separation oF two atoms? (Caution: be careFul with the sign here.) 1. 0.9 2. 1.3 3.-0.2 4.-0.9 5.-1.2 6. 0.2 correct Version 046/AACDC QTest #8 Antoniewicz (56445) 2 Explanation: The minimum amount of energy needed is to bring the system from present state where E i = ( K + U ) i =-. 2 eV to the Fnal state where E f = ( K + U ) f = 0. The energy principle is E f-E i = W E = W = E f-E i = 0-(-. 2 eV) = 0 . 2 eV ....
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This note was uploaded on 11/17/2011 for the course PHY 303K taught by Professor Turner during the Fall '08 term at University of Texas at Austin.

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QTest #8-solutions - Correct answer: 9 . 702 10 8 W....

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