problem07_38

University Physics with Modern Physics with Mastering Physics (11th Edition)

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7.38: a) Considering only forces in the x -direction, , F dx dU x - = and so the force is zero when the slope of the U vs x graph is zero, at points b and d . b) Point b is at a potential minimum; to move it away from b would require an input of energy, so this point is
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Unformatted text preview: stable. c) Moving away from point d involves a decrease of potential energy, hence an increase in kinetic energy, and the marble tends to move further away, and so d is an unstable point....
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