Heat Engines: During each cycle, a heat engine takes in 4.0 J of heat, does 1.0 J of work, and expels 3.0 J of heat. What is its efficiency?
Fill in the blank(s) with the appropriate word(s).
25%
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Scientists in the 1800s suggested that the source of the Sun's energy might be gravitational contraction. What was the major flaw of this hypothesis?
A) Contracting objects cool down rather than heat up. B) This process would power the Sun for only about 25 million years, but geologists already had evidence the Earth was much older than that. C) The Sun had been observed to be expanding, not contracting. D) The predicted amount of contraction should have been large enough for astronomers of that time to measure.
When gaseous elements combine:
a. infinite amounts of each gas can combine in the same space because gases are not matter. b. very precise ratios of each gas combine to form gaseous compounds. c. gases only combine as mixtures, not as compounds. d. most cannot form compounds because they are already in the form of diatomic (i.e. two-atom) molecules. e. they form compounds with unpredictable ratios of each element.
A thermometer is made such that the freezing point of water is defined to be 60.0°H and the boiling point of water at sea level is defined to be 520°H. What is absolute zero on the H scale?
A) 0.6°H B) -36°H C) -980°H D) -1256°H E) -1196°H
A heavily loaded boat is floating in a pond. The boat starts to sink because of a leak but quick action plugging the leak stops the boat from going under, although it is now deeper in the water. What happens to the surface level of the pond?
a. It stays the same. b. It goes up. c. It goes down. d. More information is needed to reach a conclusion.