The weight of a thin flat plate 40 cm 3 40 cm in size is balanced by a counterweight that has a mass of 2 kg, as shown in the figure. Now a fan is turned on, and air at 1 atm and 258C flows downward over both surfaces of the plate with a free-stream velocity of 10 m/s. Determine the mass of the counterweight that needs to be added in order to balance the plate in this case.

Transcribed Image Text:

Bo Air 25°C, 10 m/s ↓↓↓ Plate 40 cm 40 cm