Suppose that Earth's atmosphere had no greenhouse gases. Then Earth's average surface temperature would be
A) about the same as it is now.
B) slightly cooler, but still above freezing.
C) well below the freezing point of water.
D) slightly warmer, but still well below the boiling point of water.
C
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Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the same direction. Jake's speed relative to the ground is
A) 6 m/s. B) 10 m/s. C) 14 m/s. D) none of the above
Special relativity predicts that moving clocks run slow
a. True b. False Indicate whether the statement is true or false
Geologists think that Earth is how old?
a. 4560 billion years b. 45.6 thousand years c. 45.6 million years d. 4.56 billion years
While a material is changing state:
a. its temperature is constantly changing. b. its temperature stays constant. c. its atomic and molecular motions become less limited. d. its internal (thermal) energy stays constant. e. the amount of heat needed is given by its specific heat.