A 2780 lb car is traveling at sea level at a constant speed. Its engine is running at 4500 rev/min and
is producing 175 ft-lb of torque. It has a drivetrain efficiency of 90%, a drive axle slippage of 2%, 15-
in radius wheels, and an overall gear reduction ration of 3 to 1. If the car's frontal area is 21.5 ft²,
what is its drag coefficient? Pay attention to the units and write your answer in two decimal places,
unless otherwise specified.
V =
Fe =
frl =
Rrl=
Cd =
ft/s
lbs
(three decimal places)
Commer
lbs
Fig: 1