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29_Ch 15 College Physics ProblemCH15 Electric Forces and Electric Fields

# 29_Ch 15 College Physics ProblemCH15 Electric Forces and Electric Fields

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Electric Forces and Electric Fields 29 The period of the pendulum will be 2 0.500 m 2 2 0.307 s " " 210 m s L T g π π = = = (b) Y . The force of gravity is a significant portion of the total downward force acting on the ball. Without gravity, the effective acceleration would be es 2 -3 0.200 N 200 m s 1.00 10 kg e F g m = = = × giving 2 0.500 m 2 0.31 200 m s T π = = 4 s a 2.28% difference from the correct value with gravity included. 15.57 The sketch at the right gives a free-body diagram of the positively charged sphere. Here, 2 2 1 e F k q r = is the attractive force exerted by the negatively charged sphere and
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