The ocean thermal energy conversion project uses the surface water near tropical islands with a temperature of 20C as the hot temperature reservoir,
and the water at some depth, with a temperature of 5.0C, as the cold temperature reservoir for a heat engine. What is the maximum possible efficiency of an engine running between those two temperatures?
A) 30 B) 4.7 C) 7.9 D) 15 E) 5.1
Question 2
Alicia intends to swim to a point straight across a 100 m wide river with a current that flows at 1.2 m/s. She can swim 2.5 m/s in still water. At what angle, measured from the upstream direction, must she swim upstream to achieve her goal?
What will be an ideal response?
