Aprototype boat is 30 meters long and is designed to cruise at 9 m/s. its drag is to be simulated by a 0.5-meter-long model pulled in a tow tank. for froude scaling find a)-the tow speed b)-the ratio of model to prototype drag c)-the ratio of model to prototype power.

Avolume of 2.65 m3 of air in a rigid, insulated container fitted with a paddle wheel is initially at 264 k, 5.6 bar. the air receives 432 kj by work from the paddle wheel. assuming the ideal gas model with cv = 0.71 kj/kg • k, determine for the air the amount of entropy produced, in kj/k