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Q3. (a) The heat generated by an electric current following through a wire varies directly as the lime, I seconds. the square of the voltage, V volts, and indirectly as the resistance, R ohms.

When the voltage is 40 volts and the resistance is 70 ohms the heat generated after 15 seconds is 480 units.

Determine the heat generated in 20 seconds when the voltage is 30 volts and the resistance is 42 ohms. (6)

(b) A propulsion problem causes a reduction in a ship's speed of 4 knots throughout a passage of 360 nautical miles, resulting in the ship arriving at its destination S hours behind schedule.

Calculate the normal service speed of the ship.