What evidence leads astronomers to conclude that the universe contains a mysterious dark energy?
A) The expansion of the universe is accelerating with time.
B) The gravity of distant galaxies is stronger than that of galaxies nearby.
C) Studies of galactic motion indicate that there is more matter in the universe than we can account for with stars and gas.
D) Stars shine much more brightly than we would expect from nuclear fusion.
E) The existence of such dark energy is the only way to account for evil in the universe.
A) The expansion of the universe is accelerating with time.
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What is the solar wind?
A) a stream of charged particles flowing outward from the surface of the Sun B) the uppermost layer of the Sun, which lies just above the corona C) the strong wind that blows sunspots around on the surface of the Sun D) the wind that causes huge arcs of gas to rise above the Sun's surface
A 75-N object is pulled on a horizontal surface by a horizontal pull of 50 N to the right. The friction force exerted on this object is 30 N to the left. What is the acceleration of the object?
A) 0.27 m/s2 B) 1.1 m/s2 C) 2.6 m/s2 D) 11 m/s2
When we look into the band of light in our sky that we call the Milky Way, can we see distant galaxies? Why or why not? (Assume we are looking with visible light telescopes.)
A) Yes, distant galaxies appear as small, fuzzy patches of light within the Milky Way band. B) yes, but only when we look in the direction of the constellation Sagittarius C) no, because the stars, gas, and dust of the Milky Way block our view of more distant objects D) no, because galaxies exist only above and below the plane of the Milky Way E) no, because distant galaxies are too dim to be seen even with powerful telescopes
An 18-wheeler and a Volkswagon Beetle are rolling along with the same momentum. Which one is going faster?
A. 18-wheeler B. Volkswagon beetle C. same for both D. impossible to say