1. Consider a fan located in a 3 ft * 3 ft square duct. Velocities at various points at the outlet are measured, and the average flow velocity is determined to be 22 ft/s. Taking the air density to 0.075 lbm/ft^3 estimate the minimum electric power consumption of the fan 2. motor. Large wind turbines with blade span diameters of over 100m are available for electric power generation. Consider a wind turbine with a blade span diameters of 100 m installed at a site subjected to steady winds at 8 m/s. Taking the over-all efficiency of the wind turbine to be 32 percent and the air density to be 1.25 kg/m3 generated by this wind turbine. Also, assuming steady winds of 8 m/s during a 24-hour period, determine the amount of electric energy and the revenue generated per day for a unit price of $0.09/kWh for electricity. 3. An adiabatic closed system on earth is accelerated vertically from rest to 25m/s and the system is raised by a height of 110m. The system has a mass of 1.2 kg. If 1.8kJ of work is put into the system, determine the change in internal energy in kJ/kg. 4. A power plant extracts potential energy from a river to provide electrical power. The average amount of water flowing through the plant is 101,000lbm/s. The water intake for the power plant is 676 ft above the exit valves. If the power plant produces 100,000 hp, what is the efficiency of the power plant