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Q1. A weightlifter has been given a barbell to lift. One end has a mass of 5.05 kg while the other end has a mass of 5.20 kg. The bar is 0.20 m long. (Consider the bar to be massless, and assume that the masses are thin disks, so that their centers of mass are at the ends of bar.) How far from the heavier end should she hold the bar so that weight feels balanced?

Q2. Four identical masses of mass 700mg each are placed at the corners of a square whose side lengths are 15.00 cm. What is the magnitude of the net gravitational force on one of the masses, because of the other three?

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