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Q. A particular guitar string is supposed to vibrate at 199Hz, but it is measured to in fact vibrate at 215Hz. By what percent should the tension in string be transformed to get the frequency to correct value? (Your answer should be positive for an increase and negative for a decrease in the tension.)

Q. Two charged dust particles exert a force of 4.20 x 10^-2 N on each other. What would be the force if they are moved so they are only one-eight as far apart?

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