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Q. Three equal point charges, each with charge 1.15 mu C, are placed at vertices of an equilateral triangle whose sides are of length 0.500 m. What is an electric potential energy U of the system? (Take as zero the potential energy of the three charges when they are infinitely far apart.)

Q. Consider a too-small space station that consists of a 2.7m radius rotating sphere. A man standing inside is 1.9m tall and his feet are at 1g. What is the acceleration of his head?

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