Which of the following statements about large-scale structure is probably not true?
A) Clusters and superclusters appear to be randomly scattered about the universe, like dots sprinkled randomly on a wall.
B) Galaxies and clusters have grown around tiny density enhancements that were present in the early universe.
C) Voids between superclusters began their existence as regions in the universe with a slightly lower density than the rest of the universe.
D) Many cluster and superclusters are still in the process of formation as their gravity gradually pulls in new members.
A) Clusters and superclusters appear to be randomly scattered about the universe, like dots sprinkled randomly on a wall.
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Why are lunar eclipses more commonly seen than solar eclipses?
A) Lunar eclipses occur at night and are easier to see. B) The Moon goes around the Earth faster than the Earth goes around the Sun. C) Earth casts a bigger shadow than the Moon. D) The tilt of the Moon's axis is smaller than the Earth's. E) The Moon is much closer to Earth than to the Sun.
How many joules of energy are required to accelerate a 1.0-kg mass from rest to a speed of 86.6% the speed of light? (c = 3.00 × 108 m/s)
A) 2.7 × 1012 J B) 3.0 × 103 J C) 4.5 × 109 J D) 1.8 × 1017 J E) 9.0 × 1016 J
A block of wood is floating in water. If the temperature of the water increases, what happens to the fraction of the block above water?
a. It increases. c. It stays the same. b. It decreases. d. It can be any of the above answers depending on the initial and final temperatures.