The truck has a drag coefficient of C D = 0.86 when it is traveling with a constant velocity of 60 km/h. Determine the power needed to drive the truck at this speed if the average front projected area...

The truck has a drag coefficient of C_D
= 0.86 when it is traveling with a constant velocity of 60 km/h. Determine the power needed to drive the truck at this speed if the average front projected area of the truck is 10.5 m². The air is at a temperature of 10°C.

A 600 mm by 600 mm square plate is held in air at 30°C, which is blowing at 12 m/s. Compare the drag on the plate when it is held normal and then parallel to the airflow.