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Q. Mary needs to row her boat across a 100-{rm m}-wide river that is flowing to the east at a speed of 1- {rm m/s}. Mary can row the boat with a speed of 2- {rm m/s} relative to the water.

Q. A 30.0 mu F capacitor initially charged to 20mu C is discharged through a 2.40 kOmega resistor. How long does it take to decrease the capacitor's charge to 9.00 mu C?

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