Dark energy accounts for what percent of the known energy in the universe?
A) 68% B) 24% C) 8% D) 94%
A
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Which of the following statements about quasars is not correct?
A. Their cores are extremely large, probably several thousand light-years across. B. Their spectra have the largest redshifts observed. C. They are probably the most distant observable objects. D. They have abnormally high luminosities. E. Sometimes they appear in pairs, due to gravitational lenses formed by intervening galaxies.
When you float in fresh water, the buoyant force that acts on you is equal to your weight. When you float higher in the denser water of the Dead Sea, the buoyant force that acts on you is
A) greater than your weight. B) less than your weight. C) equal to your weight.
Stellar masses are determined by observing ________ stars
Fill in the blank(s) with correct word
Under standard conditions, the density of air is 1.29 kg/m3. What is the mass of the air inside a room measuring 4.0 m × 3.0 m × 2.0 m?
A) 0.32 kg B) 3.1 kg C) 31 kg D) 1.9 kg E) 19 kg