What role does an atmosphere play in surface habitability?
A) it exerts a pressure which allows liquid water to be stable
B) it protects the surface against harmful solar radiation
C) it helps generate a protective magnetic field
D) Both A and B
D
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The leaves of a positively charged electroscope diverge more when an object is brought near the knob of the electroscope. The object must be:
A) a conductor B) an insulator C) positively charged D) negatively charged E) uncharged
Harry pulls on the end of a spring attached to a wall. The reaction to Harry's pull on the spring is
A) the wall pulling oppositely on the spring. B) the spring pulling on Harry. C) both the wall and the spring pulling on Harry. D) none of the above
If the Moon is 3rd quarter phase, what shape does it have in the sky?
A) a half circle B) a quarter circle C) a full circle D) nothing (It is impossible to view a 3rd quarter moon.)
Translational (linear) speed is displacement divided by time, and rotational speed is:
a. the same thing. b. angular displacement divided by time. c. rotational acceleration divided by time. d. the distance along the edge of a rotating disk divided by time. e. translational speed divided by displacement.