Q. A rowboat crosses a river with a velocity of 3.51 mi/h at an angle 62.5° north of west relative to the water. The river is 0.800 mi wide and carries an eastward current of 1.25 mi/h. How far upstream is the boat when it reaches the opposite shore?
Q. The current in a solenoid with 22 turns per centimeter is 0.50 A. The solenoid has a radius of 1.5 cm. A long, straight wire runs along the axis of the solenoid, carrying a current of 27 A. Find the magnitude of the net magnetic field a radial distance of 0.95 cm from the straight wire.