A first class lever can give all advantages of a simple mechine ,why

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present

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What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration