"Drivi ng on asphalt roads enwils very little rolling
Chapter 11, Problem 64(choose chapter or problem)
"Drivi ng on asphalt roads enwils very little rolling resistance,INT so most of the energy of the engine goes to overcoming airresisLance. But driving slowly in dry sand is another story. Ifa 1500 kg car is driven in sand at 5.0 mis, the coeffi cient ofrolling friction is 0.06. Jn this case, nearly all of the energy thatthe car uses 10 move goes to overcoming rolling fri ction, so youcan ignore air drag in this problem.a. What propulsion force is needed to keep the car moving forwardat a constant speed?b. What power is required for propulsion at 5.0 mis?c. If the car gets 15 mpg when driving on sand, what is thecar' s efficiency? One gallon of gasoline conLains 1.4 x IO~ Jof chemical energy."
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