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Suppose a car travels 106 km at a speed of 28 m/s and uses 1.9 gals of gasoline in the process. Only 30% of the gasoline goes into useful work to keep the car moving at a constant speed.
In this problem, you may assume that 1 gallon of gasoline produces 1.2 Ă— 10^8 J of energy.
(a) What is the magnitude of the force exerted to keep the car moving at constant speed?
(b) If the required force is directly proportional to speed, how many gallons will be used to drive 106 km at a speed of 28.0 m/s?
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