26a. Suppose a car travels 111 km at a speed of 34 m/s, and uses 2 gal 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 is about 140 MJ/gal.) What is the magnitude of the force exerted to keep the car moving at constant speed
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26a. Suppose a car travels 111 km at a speed of 34 m/s, and uses 2 gal of gasoline. Only 30% of the...
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