A heavily loaded boat is floating in a pond. The boat sinks because of a leak. What happens to the surface level of the pond?
a. It stays the same.
b. It goes up.
c. It goes down.
d. More information is needed to reach a conclusion.
C
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When an atom's electrons fall down to lower energy levels in a thin cloud of hot gas, what is produced?
A) thermal radiation B) an absorption line spectrum C) an emission line spectrum D) an infrared spectrum E) new interstellar compounds
An object's distance traveled as a function of time is shown in the graph. The graph shows
A. an object turning in a circle. B. an object with increasing speed. C. an object moving forward. D. an object experiencing an acceleration.
Two point charges of +1.0 ?C and -2.0 ?C are located 0.50 m apart. What is the minimum amount of work needed to move the charges apart to double the distance between them? (k = 1/4??0 = 8.99 × 109 N • m2/C2)
A) -36 mJ B) +18 mJ C) 0 mJ D) +36 mJ E) -18 mJ
Which of the following is not a feature of a good index fossil?
a. Numerous specimens found b. Occurrence limited to a few localities c. Easily identified species d. Limited time span of existence