A plasma differs from a gas in that
A) its molecules are farther apart.
B) it is hotter than a gas.
C) it is electrically conducting.
D) its atoms are boosted to higher atomic numbers.
E) all of the above
Answer: C
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The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they are pulled apart. What happens to the strength of the electric field during this process?
A) It increases. B) It decreases. C) It remains constant. D) cannot be determined from the information given
Suppose there were no solar wind. How would the appearance of a comet in our inner solar system be different?
A) It would not have a nucleus. B) It would be much brighter in appearance. C) It would not have a coma. D) It would have only one tail instead of two.
Which of the following terms is given to a pair of stars that appear to change positions in the sky, indicating that they are orbiting one another?
A) visual binary B) eclipsing binary C) spectroscopic binary D) double star E) none of the above
You carry a 20-N box 5 m horizontally across a room. The work you do is __________
Fill in the blank(s) with correct word