An airplane wing, with chord length of 1.5 m and span of 9 m is designed to move through standard air at a speed of 7.5 m/s. A 1:10 scale model of this wing is to be tested in a water tunnel. Determine the speed necessary in the water tunnel to achieve dynamic similarity. Determine the ratio of forces measured in the model flow to those on the prototype wing.

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.