Physics for Scientists and Engineers: A Strategic Approach 5th Edition · Heat Engines and Refrigerators · Problem 40
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Randall D. Knight — Heat Engines and Refrigerators: Problem 40
At fairly slow speeds, a car’s resistance to motion is primarily due to rolling friction. (Air drag becomes significant only at higher speeds.) Suppose a 2200 kg car with rubber tires is driving at 11 mph = 5.0 m/s. The coefficient of rolling friction is 0.020. a. What propulsion power is needed to keep the car moving at a steady speed? b. The car’s drivetrain efficiency (from the motor to the wheels) is 85% and the thermal efficiency of its engine is 20%. The engine burns gasoline, which has an energy density of 130 MJ/gal. What is the car’s mpg (miles per gallon) at this speed?
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주어진 조건: , a, 2200 kg, 5.0 m, 0.020. a
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Physics for Scientists and Engineers: A Strategic Approach · 5th Edition
저자: Randall D. Knight
출판사: Pearson
단원: Heat Engines and Refrigerators