General Questions: You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the front of the train. From this observation, you can conclude that this train is
A. speeding up.
B. slowing down.
C. changing direction.
D. speeding up and changing direction.
E. slowing down and changing direction.
Answer: B
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If, with steady state heat flow established, you double the thickness of a wall built from solid uniform material, the rate of heat loss for a given temperature difference across the thickness will
A) become one-half its original value. B) also double. C) become one-fourth its original value. D) become 1/ of its original value. E) become four times its original value.
On a clear day, the sky appears to be more blue toward the zenith (overhead) than it does toward the horizon. This occurs because
A) the atmosphere is denser higher up than it is at the earth's surface. B) the temperature of the upper atmosphere is higher than it is at the earth's surface. C) the sunlight travels over a longer path at the horizon, resulting in more absorption. D) the atmosphere is more reddish over the ocean.
The above image is an example of a ________
a. protostellar disk
b. YSO
c. protostar
d. Herbig-Haro object
Which planet has the second largest moon in the solar system?
a. Jupiter b. Saturn c. Uranus d. Neptune