An object moving in a circle undergoes centripetal acceleration
a. True
b. False
Indicate whether the statement is true or false
True
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What distance method is used to determine the distance to the most distant galaxies when only a redshift is measured?
a. Hubble's law b. supernova observations c. period-luminosity relationship of variable stars d. parallax
List the three types of website structures, and give an example of how each might be used.
What will be an ideal response?
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
In the Ptolemaic system, Venus should not show phases
Indicate whether the statement is true or false