If Earth's atmosphere had no greenhouse gases, then Earth's average surface temperature would be
A) well below the freezing point of water.
B) about the same as it is now.
C) slightly cooler, but still above freezing.
D) slightly warmer, but still well below the boiling point of water.
A) well below the freezing point of water.
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Why is Saturn's moon Titan able to retain an atmosphere?
a. Titan only contains light gases which are easy to retain. b. Titan has a large enough mass and is cold enough. c. Titan is biologically active. d. It is so close to Saturn that Saturn's gravity retains Titan's atmosphere.
Suppose that a particular chemical substance is "pure" [contains no "impurities"], and that it is not possible to decompose this substance by chemical means. What can we conclude from this?
A) The substance must be a chemical compound. B) The substance must be an element. C) The substance must be one of the ideal, or perfect, gases. D) The substance must be incapable of entering into chemical reactions of any kind. E) None of the above.
According to Einstein's theory,
A) there are no limitations on the speed of any object. B) no material object can be accelerated up to lightspeed. C) material objects get easier to accelerate as they move faster. D) nothing can move at lightspeed. E) material objects become less massive as they go faster and faster.
A clown 2 m tall looks at himself in a full-length mirror (floor-to-ceiling). Where in the mirror must he look to see his feet?
a. 1 m from the floor b. 50 cm from the floor c. 25 cm from the floor d. at the bottom of the mirror e. 1.5 m from the floor