Question

6 A car is traveling at 20 mi/h on good, dry pavement at 5000 ft elevation. The front-wheel-drive car has a drag coefficient of 0.30, a frontal area of 20 ft2 and a weight of 2500 lb. The wheelbase is 110 inches and the center of gravity is 20 inches from the ground, 50 inches behind the front axle. The engine is producing 95 ft-lb of torque and is in a gear that gives an overall gear reduction ratio of 4.5. The radius of the drive wheels is 14 inches and the mechanical efficiency of the drivetrain is 90%. What would the acceleration of the car be if the driver was accelerating quickly to avoid a collision? a) 3.65 ft/s2 b) 15.53 ft/s2 c) 15.90 ft/s2 d) 3.48 ft/s2

Answer 1

Note - Air density is taken as 0.002045 slugs/

coefficient of road adhesion for good ,dry pavement- 1.00( max)

So option D is correct

Below I am attaching the table for value of coefficient of road adhesion