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p202s04-exam02

# p202s04-exam02 - Seat Physics P202 R Heinz/R de Ruyter...

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1. A charging RC circuit controls the intermittent windshield wipers in a car. The emf is 12.0 V. The wipers are triggered when the voltage across the 125- F capacitor reaches 10.0 V; then the capacitor is quickly discharged (through a much smaller resistor) and the cycle repeats. What resistance should be used in the charging circuit if the wipers are to operate once every 1.80 s? a. 8.0 k b. 12.0 k c. 16.0 k d. 20.0 k e. 24.0 k 2. How much work are the batteries in the circuit of the figure below doing in every 10.0 s time interval? a. 0.80 J b. 12 J c. 32 J d. 80 J e. 120 J
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p202s04-exam02 - Seat Physics P202 R Heinz/R de Ruyter...

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