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

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.