Question

A rear-wheel drive car is in gear with a gear reduction ratio 4 to 1 which is moving with 35
mi/h. The engine torque of the car is given by the equation Me=8ne-0.04ne
2
, CD of 0.30 and air
density of 0.002378 on the level road. The wheel base is 110 inches and gravity center is 65
inches front the rear axle and 35 inches above the road surface. If the friction coefficient of the
road is 0.6 and the car weighs 2700 pounds (Assume the car frontal area is the summation of
your student number digits in ft2
= 25 ft2
).
a. What is frontal area of the car?
b. What is the maximum acceleration if driveline efficiency is 90%, wheel radius is 15 inches,
and slippage of drive axle is 2%?

Answer 1

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