The air resistance to the motion of a vehicle is something important that engineers investigate. As you may also know, the drag force acting on a car is determined experimentally by placing the car in a wind tunnel. For a given car, the experimental data is generally represented by a single coefficient that is called the drag coefficient. It is given by the following relationship:
where
Cd = drag coefficient
Fd = measured drag force (lb)
r = air density (slugs /ft3)
V = air speed inside the wind tunnel (ft /s)
A = frontal area of the car (ft2)
What is the appropriate unit for Cd if the preceding equation is to be homogeneous in units? Show all steps of your work.
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