Elliptical galaxies are primarily made up of massive O and B stars
Indicate whether the statement is true or false
F
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Carnot Engine: The ocean thermal energy conversion project uses the surface water near tropical islands with a temperature of 20°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 possible efficiency of an engine running between those two temperatures?
A. 4.7% B. 5.1% C. 7.9% D. 15% E. 30%
Conductors: A solid aluminum cube rests on a wooden table in a region where a uniform external electric field is directed straight upward. What can we say concerning the charge on the top surface of the cube?
A. The top surface is charged positively. B. The top surface is charged negatively. C. The top surface is neutral. D. The top surface's charge cannot be determined without further information.
For a certain ideal Carnot engine, the hot reservoir is 35 C° higher than the cold reservoir. If this engine is to have an efficiency of 20%, what must be the temperature of the hot reservoir?
A) 245 K B) 175 K C) 140 K D) 70.0 K E) 210 K
Given the following energy profiles, which of the following reactions is endothermic?
A) a B) b C) c D) d E) none of the above