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QTest #9-solutions

# QTest #9-solutions - Version 078/ABADC QTest#9...

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Version 078/ABADC – QTest #9 – Antoniewicz – (56445) 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points The figure below shows a graph of potential energy versus interatomic distance for a par- ticular molecule. Rank the magnitude of the force at locations A, B, and C. (That is, which is the greatest, which is smallest, and are any of these equal to each other?) r Energy B D A C 1. | F r | B > | F r | C > | F r | A . 2. | F r | A > | F r | C = | F r | B . 3. | F r | A > | F r | B > | F r | C . 4. | F r | A = | F r | C = | F r | B . 5. | F r | C > | F r | A > | F r | B . 6. | F r | A > | F r | C > | F r | B . correct 7. | F r | B = | F r | A > | F r | C . 8. | F r | C = | F r | A > | F r | B . Explanation: We know that F r = - dU dr . Therefore, the direction of the force is oppo- site to the slope. At point A, the slope is negative, so F r is positive. At B, F r = 0. At C, F r is negative. The magnitude of F r is proportional to the magnitude of the slope.

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