The equation that describes the potential energy stored in the interaction between two atoms in a diatomic molecule is U = A/x12 – B/x6. Here A and B are appropriate constants and x is the inter-atomic distance. Find the magnitude of the force that one atom exerts on the other. a) 12A/x13 – 6B/x7 b) –13A/x13 + 7B/x7 c) –11A/x11 + 5B/x5 d) 72A/x12 – 72B/x6 e) A/x13 – B/x7

Physics for Scientists and Engineers: Foundations and Connections
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Chapter6: Applications Of Newton’s Laws Of Motion
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3) The equation that describes the potential energy stored in the interaction between two atoms in a diatomic molecule is U = A/x12 – B/x6.  Here A and B are appropriate constants and x is the inter-atomic distance.  Find the magnitude of the force that one atom exerts on the other. 

a) 12A/x13 – 6B/x7

b) –13A/x13 + 7B/x7

c) –11A/x11 + 5B/x5

d) 72A/x12 – 72B/x6

e) A/x13B/x7

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