The Local Group is a _____
A) rich galaxy cluster
B) poor galaxy cluster
C) regular galaxy cluster
D) spherical galaxy cluster
B
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Molecular Speeds: A flask contains a mixture of argon and neon gases at a stabilized temperature. The root-mean-square speed of the argon gas is determined to be 1.21 km/s. What is the root-mean-square speed of the neon gas? The atomic mass of argon is 39.95 g/mol, and that of neon is 20.18 g/mol.
Fill in the blank(s) with the appropriate word(s).
Based solely on an understanding of the greenhouse effect (as displayed in the figure), which one of the following statements is true?
a. We do not yet understand the greenhouse effect well enough to make predictions about how it affects our planet. b. Global warming poses a grave threat to our future. c. We should expect an increase in the greenhouse gas concentration to lead to global warming. d. Humans are causing global warming.
According to the Bohr model, an electron in an excited state of hydrogen can emit
A) at most a single photon until the atom re-excites. B) several photons in a series of transitions to a lower state. C) a continuous stream of light. D) none of the above
Calculate the centripetal acceleration for each of the two trials