1) A car with a projected frontal area of 1.8 m^2 is traveling at 136 KPH. If the drag coefficient of the car is 0.45 and the air density is 1.23 kg/m^3, find the total aerodynamic drag force on the car, and the power required to overcome this drag force.
2) A high speed train is traveling at 67 m/s. the wetted area of the train contributing to aerodynamic drag is 4500 m^2. The air density is 1.23 kg/m^3. If the rolling frictional force is determined to be 47,500 N and the power required to sustain the current velocity is 4.681 ,MW, determine the approximate drag coefficient of the train.