According to the nebular theory of solar system formation, which of the following best explains why the solar nebula ended up with a disk shape as it collapsed?
A) As the nebula shrank and rotated faster, collisions between orbiting particles caused it to flatten into a disk.
B) The nebula was fairly flat to begin with, and retained this flat shape as it collapsed.
C) The force of gravity pulled material that was spherically distributed downward into a flat disk.
D) the law of conservation of energy
A) As the nebula shrank and rotated faster, collisions between orbiting particles caused it to flatten into a disk.
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A 1.15-kg grinding wheel 22.0 cm in diameter is spinning counterclockwise at a rate of 20.0 revolutions per second
When the power to the grinder is turned off, the grinding wheel slows with constant angular acceleration and takes 80.0 s to come to a rest. (a) What was the angular acceleration (in rad/s2 ) of the grinding wheel as it came to rest if we take a counterclockwise rotation as positive? (b) How many revolutions did the wheel make during the time it was coming to rest?
What is happening deep inside a star while it expands into a subgiant?
A) It is fusing hydrogen to produce helium in the core. B) It is fusing hydrogen to produce helium in a shell around the core. C) It is fusing helium to produce carbon in the core. D) It is fusing helium to produce carbon in a shell around the core. E) It is not fusing any element; it is contracting and heating up.
What evidence suggests that long gamma ray bursts originate from supernovae of stars massive enough to form black holes?
A) Some gamma ray bursts have been found to originate with galaxies that are actively forming stars, and would thus have a few very massive (but short lived) stars. B) Rapid observations in other wavelengths show that some gamma ray bursts coincide with points showing typical supernova light curves. C) The locations of gamma ray bursts suddenly begin blocking light from more distant stars. D) A and B E) B and C
Sunspots are hotter than the photosphere
a. True b. False Indicate whether the statement is true or false