Observations of galaxies and clusters of galaxies indicate that about ___________ percent of the matter in the universe is dark matter
a. 5
b. 25
c. 35
d. 45
e. 90
e
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A eutectoid-composition
The radius of a circle is tripled. By what factor is the area changed?
A. 3 B. 6 C. 9 D. 12
Sunsets are red because
A) the Sun emits more red light when it's setting. B) sunlight must pass through more atmosphere then, and the atmosphere scatters even more light at bluer wavelengths, transmitting mostly red light. C) sunlight must pass through more atmosphere then, and the atmosphere scatters more light at red wavelengths than bluer wavelengths. D) the cooler atmosphere in the evening absorbs more blue light. E) none of the above
One of the curators at the art museum is tilting a large cylinder backward. At what angle ? will the cylinder of height h and radius r be in unstable equilibrium?
a.
