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 "" 2 1 0 ms L T g ππ == = (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 “” 2 0 0 1.00 10 kg e F g m = × giving 2 0.500 m 20 . 3 1 200 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 kq r = is the attractive force exerted by the negatively charged sphere and 2 F qE = is exerted by the electric field.
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## This note was uploaded on 12/09/2011 for the course PHYS 2020 taught by Professor Staff during the Fall '10 term at FIU.

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