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.

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

When using the ohmmeter function of a digital multimeter, the leads are placed in what position relative to the component being tested? a. parallel b. control c. series d. line

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.