Since natural gas creates carbon dioxide, why would it reduce global warming to switch from coal to natural gas?
A) Actually, such a change would not reduce global warming.
B) Because electricity from natural gas plants would cost more and thus it would be used less.
C) Because mining is not needed in order to obtain natural gas.
D) Because natural gas uses less carbon per joule of energy than does coal.
E) Because natural gas plants produce a less polluting type of carbon dioxide.
D
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This photo shows the central region of a cluster of galaxies. Based on what you have learned from your text, which of the following statements about this photo is not true?
A) The oldest stars in these galaxies are much older than the oldest stars in our own Milky Way. B) Half for more of the large galaxies we see in this photo are elliptical galaxies. C) Many of the galaxies in this photo have probably suffered collisions in the past. D) These galaxies are held together by their mutual gravitational attraction.
Inside a room at a uniform comfortable temperature, metallic objects generally feel cooler to the touch than wooden objects do. This is because:
A. a given mass of wood contains more heat than the same mass of metal B. metal conducts heat better than wood C. heat tends to flow from metal to wood D. the equilibrium temperature of metal in the room is lower than that of wood E. the human body, being organic, resembles wood more closely than it resembles metal
According to current understanding, how did the first generation of stars differ from stars born today?
A) They contained much more hydrogen and helium than stars born today. B) They were much cooler in temperature than most stars born today. C) They were much more likely to be members of binary star systems than stars are born today. D) They were much more massive than most stars born today.
Two thermometers are calibrated, one in degrees Celsius and the other in degrees Fahrenheit. At what temperature (in kelvins) do their readings measure the same temperature?
a. 218.15 b. 233.15 c. 273.15 d. 40.15 e. 0