Suppose a car travels 108 km at a speed of25.0m/s, and uses1.90gallons of gasoline. Only 30% of
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Suppose a car travels 108 km at a speed of25.0m/s, and uses1.90gallons of gasoline. Only 30% of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (The energy content of gasoline is1.30108Jper gallon.)
(a)What is the force (in N) 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 108 km at a speed of28.0 m/s?
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