Carnot Engine: What is the efficiency of an ideal Carnot engine operating between a reservoir in which ice and water coexist, and a reservoir in which water and steam coexist? The pressure is constant at 1.0 atm for both reservoirs.
A. 27%
B. 0.27%
C. 100%
D. 1.0%
E. 15%
Answer: A
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General Questions: A small car and a large SUV are at a stoplight. The car has a mass equal to half that of the SUV, and the SUV can produce a maximum accelerating force equal to twice that of the car. When the light turns green, both drivers push their accelerators to the floor at the same time. Which vehicle pulls ahead of the other vehicle after a few seconds?
A. The car pulls ahead. B. The SUV pulls ahead. C. It is a tie.
Copernicus' model was significantly better at predicting future positions of planets than Ptolemy's.
Answer the following statement true (T) or false (F)
At Chernobyl, one of the harmful radioactive isotopes was 131I, a beta emitter with a halflife of 8 days. Suppose some of this isotope is deposited on a field. What can we say about this field 40 days later?
A) It is just as radioactive as it was to begin with. B) Its radioactivity has decreased to harmless levels. C) Its radioactivity level has decreased to 1/32 of its original level. D) Its radioactivity level has decreased to 1/16 of its original level. E) Its radioactivity level has decreased to 1/64--one sixty-forth--of its original level.
Why does Jupiter have several distinct cloud layers?
A) Different gases are present at different altitudes in Jupiter's atmosphere.
B) Clouds form randomly, so on average there are always several layers.
C) Different layers represent the various regions where the temperature is cool enough for liquid water to condense.
D) Winds prevent clouds from forming at some altitudes, so we see clouds only at the other altitudes.
E) Different layers represent clouds made of gases that condense at different temperatures.