A goldfish bowl is spherical, 8.0 cm in radius. A goldfish is swimming 3.0 cm from the wall of the bowl. Where does the fish appear to be to an observer outside?

The index of refraction of water is 1.33. Neglect the effect of the glass wall of the bowl.
A) 3.3 cm inside the bowl
B) 3.9 cm inside the bowl
C) 2.5 cm inside the bowl
D) 3.0 cm inside the bowl
E) 1.7 cm inside the bowl


Answer: C

Physics & Space Science

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The textbook shows a graph of the history of U.S. energy use since 1950. According to this graph, which of the following resources presently delivers the most energy [or energy equivalent] annually to the United States?

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Two wires A and B with circular cross sections are made of the same metal and have equal lengths, but the resistance of wire A is three times greater than that of wire B. What is the ratio of the radius of A to that of B?

1.3 2.?3 3.1 4.1/?3 5.1/3

Physics & Space Science