A steady wind of 50m * s ^ - 1 blows against a rigid wall, which is in a plane perpendicular to the Wind direction. Estimate the pressure exerted by the wind on the wall. Density of air is 1.25 kg m ^ - 3 . State any assumption you made in your calculations.

Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.