Question

ient of 0.31 and a frontal If rolling resistance is 1.5% P10-21 A BMW 520 has a drag coefficient of o area of 22.5 ft². It weighs 3,500 lbf. If rolling re of the weight, determine a. the speed at which drag resistance becomes rolling resistance (in mi/h). ce becomes larger than the d to cruise at 45 mi/h and b. the power (in kW and hp) required to cruise at a 75 mi/h.

Answer 1

FD CD fAv2 52-5: 0, 3 } (22.5)@V 2 -fo CD A "py,3 = +Fep v → ⑥»)(us) (。.on) v (S2.sjv 2 2