17. California has an excess of energy generated by Solar panels. The energy falling from the Sun is 1000W/m2 . The efficiency of Solar panels is roughly 15% at this time. The idea has been proposed to pump water from the Colorado river to Lake Mead during the day, and to generate electricity using Hoover Dam and its generators at night. The height gain is 1200m. What is the required area of Solar panels to generate 1 GW of electricity

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.