What If We Were Not Neutral A 75-kg person holds out his
Chapter 21, Problem 10E(choose chapter or problem)
What If We Were Not Neutral? A 75-kg person holds out his arms so that his hands are 1.7 m apart. Typically, a person’s hand makes up about 1.0% of his or her body weight. For round numbers, we shall assume that all the weight of each hand is due to the calcium in the bones, and we shall treat the hands as point charges. One mole of Ca contains 40.18 g, and each atom has 20 protons and 20 electrons. Suppose that only 1.0% of the positive in each hand were unbalanced by negative charge. (a) How many Ca atoms does each band contain? (b) How many coulombs of unbalanced charge does each hand contain? (c) What force would the person’s arms have to exert on his hands to prevent them from flying off? Does it seem likely that his arms are capable of exerting such a force?
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