You are in a hot, dense place. You are surrounded by nuclear reactions that are rapidly fusing hydrogen into helium. You notice that your surroundings are cooling and rapidly dropping in density. Within about 5 minutes, the fusion reactions stop
Where are you?
A) You are in the center of a massive star near the end of its life.
B) You are inside a nuclear power plant on Earth.
C) You are in the early universe during the era of nucleosynthesis.
D) You are in the center of a star very much like our Sun.
E) You are in the center of a star much smaller than the Sun.
C
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How does Earth's varying distance from the Sun affect our seasons?
A) It doesn't—Earth's orbital distance plays no significant role in the seasons.
B) It causes the seasons to be more extreme than they would be if the Earth's distance from the Sun were always the same.
C) It makes summer warmer in the Northern Hemisphere than in the Southern Hemisphere.
D) It is responsible for the fact that the seasons are opposite in the Northern and Southern hemispheres.
If you are asked to make a very sensitive glass thermometer, which of the following working fluids would you choose?
1.mercury 2.alcohol 3.gasoline 4.glycerin
Starburst galaxies produce most of their light in the wavelength range of
A) X-rays. B) the ultraviolet. C) the visible. D) the infrared. E) all wavelengths.
Boat 1 goes directly across a stream a distance L and back taking a time t1 . Boat 2 goes down stream a distance L and back taking a time t2 . If both boats had the same speed relative to the water, which of the following statements is true?
a. t2 > t1 b. t2 < t1 c. t2 = t1 d. t2 = 2t1 e. t2 = 0.5t1