3.A sphere of diameter of 1.00 m is immersed in a river. The velocity of the approaching flow is 2.0 m/s. A model experiment is carried out using air as the working fluid to predict the drag force...

Extracted text: 3.A sphere of diameter of 1.00 m is immersed in a river. The velocity of the approaching flow is 2.0 m/s. A model experiment is carried out using air as the working fluid to predict the drag force acting on the sphere. The diameter of the model sphere is 0.10 m. Determine the approaching velocity (m/s) of air flow in terms of the Reynolds number similitude by assuming that the temperatures of air and water are 20 C.