The level of water in a city water tower is 125ft. above the ground. the tank is kept with an air space which can be pressurized with compressed air. it is important to maintain a pressure at the bottom of the tower at 75 psig. what gauge pressure has to be applied to the air in the top of the tower to get the required pressure at the bottom of the tower. if the atmospheric pressure is 755mmhg, what is the absolute pressure at the bottom of the tower. draw the system and show the pressure gauges.

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?

The characteristic roots of a dynamic system are: 1.7920 1.8160 i, -1.7920 1.8160 i, -0.4160 what is the order of this system? what are the settling time and damping ratio of the system?

How much power could a wind turbine produce if it had the following specifications? cp = 0.45 -d=1.2kg/m3 d=50m v 5m/s