Suppose a car travels 108 km at a speed of 25.0 style=”color:rgb(0,0,0);”> m/s, and uses 1.90 gallons 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 1.3 ✕ 108 J per gallon.)
Suppose a car travels 108 km at a speed of 25.0
style=”color:rgb(0,0,0);”> m/s, and uses 1.90 gallons 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 1.3 ✕ 108 J per gallon.)