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Q. Using the capacitance determined in part (a),which equals 21 micro F, calculate the current in the circuit 6.6 ms after the switch is closed. Assume that the capacitor is uncharged initially and that the emf of the battery is 9.0 {rm V}. Resistance= 160 ohms.

Q. A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 1200 N and the angle between the two ropes is 19.0^circ. How hard must each player pull to drag the coach at a steady 1.90 {rm m/s}?

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