Which of the following would not be considered evidence for dark matter in clusters of galaxies?
A) the total amount of stars
B) the temperature of the intergalactic gas
C) the velocities and radii of galaxy orbits around the center of mass in the cluster
D) the curvature of gravitationally-lensed galaxies
A
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The distance between Earth and the Sun is 93,000, 000 miles, or one ______________
Fill in the blank(s) with correct word
If the average kinetic energy of a volume of ideal gas increases, what must be true?
A. the density decreases B. the pressure increases while the temperature stays the same C. the temperature increases while the pressure stays the same D. both the pressure and temperature increase
What is postulated to have caused a sudden inflation of the early universe?
A) the energy absorbed by giant quantum fluctuations B) the energy released from the "freezing out" of the strong force from the GUT force C) the energy released from the annihilation of matter and antimatter D) the energy absorbed by the separation of the electromagnetic and weak forces E) the energy released in the fusion of protons and neutrons to produce helium
Farsightedness can usually be corrected with
A) convex lenses. B) concave lenses. C) convex mirrors. D) cylindrical lenses. E) concave mirrors.