Example Problem - Pressure Drag (2)
Channel: Thermofluids
Date: 2020-04-17

"John drives a 2013 Honda Accord which has a coefficient of drag of 0.30 and a frontal area of 52" x 73".

Determine the following:
(a) The amount of drag force acting on the car when driving down I-29 at 80 mph, assuming ambient conditions are 20°C and 1 atm, and that there is zero wind that day. 
(b) The amount of power the engine would have to expend to fight drag force. 
(c) If John were to speed (this is hypothetical, of course, John is a responsible adult and would never violate the speed limit) by 10 mph, meaning he were traveling down I-29 at 90 mph, how would that affect the amount of power the engine would have to expend to fight drag force?
(d) On a completely unrelated note, what is the theoretical maximum speed of the car, assuming 100% of its maximum rated power (185 hp) was expended again air-resistance (i.e. neglecting rolling resistance and mechanical resistance)."

PDF of solution: https://sdsu.box.com/s/xumig3xwae5fbdyy3peuc6qv101r1yvy