Calculate the efficiency of a solar cell having imax = 5.7 milli amp each small cell/unit with 1500 of unit/cells together in a and in a voltage range of 24 volt. assume the solar illumination source is 150 watts in a 70-inch by 39-inch array. calculate efficiency

Water in a partially filled large tank is to be supplied to the roof top, which is 8 m above the water level in the tank, through a 2.2-cm-internal-diameter pipe by maintaining a constant air pressure of 300 kpa (gage) in the tank. if the head loss in the piping is 2 m of water, determine the discharge rate of the supply of water to the roof top in liters per second.