Which of the following statements about large-scale structure is probably not true?
A) Galaxies and clusters have grown around tiny density enhancements that were present in the early universe.
B) Voids between superclusters began their existence as regions in the universe with a slightly lower density than the rest of the universe.
C) Many cluster and superclusters are still in the process of formation as their gravity gradually pulls in new members.
D) Clusters and superclusters appear to be randomly scattered about the universe, like dots sprinkled randomly on a wall.
D
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Consider an aluminum rod encircling the Earth (radius 6378. km). If the linear thermal expansion coefficient of the aluminum is 24. × 10-6 (C°)-1,
and if the temperature of the rod increases by 1.0 C°, how high off the ground would the expanded ring be (assuming uniform space all around)?
The quantum of the gravitational force is the
A) muon. B) graviton. C) pion. D) quark. E) newton.
Two paths lead to the top of a big hill. One is steep and direct, while the other is twice as long but less steep. How much more potential energy would you gain if you take the longer path?
a) the same b) twice as much c) four times as much d) half as much e) you gain no PE in either case
The Hubble Space Telescope
a. has a flawed primary mirror. b. has been repaired. c. has failed. d. none of the above