A star (no matter what its mass) spends most of its life:
A) as a protostar.
B) as a main sequence star.
C) as a planetary nebula.
D) as a red giant or supergiant.
E) as a T Tauri variable star.
B
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A piece of iron sinks to the bottom of a lake where the pressure is 21. atm. Which statement best describes what happens to the volume of that piece of iron?
A) There has been no change in the volume of the iron. B) Its volume becomes 21. times greater. C) Its volume decreases slightly. D) Its volume increases slightly.
A boat is floating in a small pond. The boat then sinks so that it is completely submerged. What happens to the level of the pond?
a. It increases. b. It decreases. c. It stays the same. d. In some cases it would decrease, in others it would stay the same. e. In some cases it would increase, in others it would stay the same.
Which of the following wires can carry the most current?
FM radio only operates in the frequency range 88 MHz to 108 MHz because
a. higher or lower frequencies are blocked by the ionosphere b. higher and lower frequencies are not radio waves c. the government set those limits d. none of the above