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Question1

Two charged pith balls are suspended on extremely light 102 strings. Each has a mass 10g. In stability, the total angle between the strings is 15degrees. Sketch a free body diagram for one of the pith balls and clearly label all forces with magnitude and direction. Assume the pith balls are equally charged, what is charge on each ball? (This is not a qualitative prediction; a numerical answer has to be obtained)

Question2

The mass of the moon is 7.35 x 10^22 kg, even as that of the earth is 5.98x10^24 kg. The average distance from center of the moon to the center of Earth is 384,400 Km. what is size of the gravitational force that Earth exerts on the moon?

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