How are galaxies spread throughout the universe?
A) Galaxies are densest near the Milky Way Galaxy and become less and less numerous the farther we look out into the universe.
B) Galaxies are grouped in clusters that are spread more or less evenly throughout the universe.
C) Galaxies are spread more or less evenly throughout the universe.
D) Clusters of galaxies exist that are themselves often clustered into superclusters. Clusters and superclusters appear to be distributed on surfaces surrounding empty regions of space.
Answer: D) Clusters of galaxies exist that are themselves often clustered into superclusters. Clusters and superclusters appear to be distributed on surfaces surrounding empty regions of space
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Supermassive black holes are believed to be located at the center of many galaxies because
a. the rotation curve of the galaxy indicates that 90% of the galaxy is dark matter. b. the orbital motion of material near the center is very fast and indicates a very massive core. c. the shape of the bulge in all spiral galaxies can only be supported by a supermassive black hole. d. the spiral structure requires a black hole to maintain the spiral arms. e. the orbital speeds of a globular clusters in the galaxy are greater than the speed of light.
Do either Venus or Mars have composite volcanoes? Why or why not?
a. Venus has some composite volcanoes because of large currents of magma beneath the crust. Mars has only shield volcanoes because tectonics on Mars does not occur. b. Mars has some composite volcanoes because of its great shield volcano explosions. Venus has only shield volcanoes because of its low-density crust. c. Yes, volcanoes on Venus and Mars are higher, wider and have the composite structure because of repeated eruptions at the same place. d. Mars and Venus only have shield volcanoes. Geological processes are vertical on these planets, and plate tectonics and significant horizontal crust motion do not occur.
PEEK, along with other polymers, such as PPE, PEK, PSU, and PES, is a highperformance _________polymer.
Fill in the blank(s) with the appropriate word(s).
A 100-W resistance heater is connected to a 110-V dc source. What current flows through the heater?
A) 1.1 A B) 2.2 A C) 3.3 A D) 4.4 A E) 0.91 A