Question

A car is traveling at 20 mi/h on a roadway covered with hard-packed snow (coefficient of road adhesion of 0.25). The car has CD = 0.30, A_f = 22 ft², and W = 2800 lb. The wheelbase is 120 inches, and the center of gravity is 20 inches above the roadway surface and 50 inches behind the front axle. The air density is 0.002045 slugs/ft³. The car’s engine is producing 100 ft-lb of torque and is in a gear that gives an overall gear reduction ratio of 4.5 to 1, the wheel radius is 14 inches, and the mechanical efficiency of the drivetrain is 80%. If the driver needs to accelerate quickly to avoid an accident, what would the acceleration be if the car is front-wheel drive

Select one:

a. 3.78 ft/s^2

b. 3.83 ft/s^2

c. 2.83 ft/s^2

d. 2.78 ft/s^2

Answer 1

Solution:

Answer: c. 2.83 ft/s^2

Detailed solution is provided in the images below

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