As we explained in earlier chapters, the drag force acting on a car is determined experimentally by placing the car in a wind tunnel. The drag force acting on the car is determined from
where
Fd = measured drag force (N or lb)
Cd = drag coefficient (unitless)
ρ = air density (kg /m3 or slugs /ft3)
V = air speed inside the wind tunnel (m/s or ft /s)
A = frontal area of the car (m2 or ft2)
The power requirement to overcome the air resistance is computed by
Plot the power requirement (in hp) to overcome the air resistance for a car with a frontal area of 2800 in2, a drag coefficient of 0.4, and for an air density of 0.00238 slugs/ft3. Vary the speed from zero to 110 ft /s (75 mph). Also, plot the rate of change of power requirement as a function of speed.
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