The ocean thermal energy conversion project uses the surface water near tropical islands with a temperature of 20.0°C as the hot temperature reservoir, and the water at some depth,
with a temperature of 5.0°C, as the cold temperature reservoir for a heat engine. What is the maximum efficiency of an engine running between those two temperatures?
A) 4.7%
B) 5.1%
C) 7.9%
D) 15%
E) 30%
B
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Lobate scarps are believed to have formed on Mercury when its interior cooled and shrank
a. True b. False Indicate whether the statement is true or false
A blob of clay, mass M, is propelled upward from a spring that is initially compressed by an amount d. If, upon its release, the clay reaches an ultimate height of h above the unstretched spring’s end, what is the spring constant k?
a. 
b. 
c. 
d. 
What type of eruption does a cinder cone volcano have?
What will be an ideal response?
The Sahara in northern Africa is an example of a
A) rain shadow desert on the downslope of a large mountain range. B) cold ocean current desert formed by local winds coming off cool ocean areas. C) horse latitude desert formed by Earth's tradewinds. D) subtropical desert formed when tropical areas are overwhelmed by sand.