The drag force, Fd, imposed by the surrounding air on a vehicle moving with velocity V is given by Fd = CdA^1/2V^2
where Cd is a constant called the drag coefficient, A is the projected frontal area of the vehicle, and r is the air density. Determine the power, in hp, required to overcome aerodynamic drag for an automobile moving at:

a. 25 miles per hour.
b. 70 miles per hour. Assume Cd = 0.28, A = 25 ft^2, and rho = 0.075 lb/ft^2.

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.