Venus is very hot because its atmosphere is rich in carbon dioxide
Indicate whether the statement is true or false
T
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Scientists do not know what dark energy is, yet they claim that it is the dominant constituent of the mass-energy of the universe. What (if any) evidence supports this claim?
A) There are two lines of evidence: (1) measurements of the accelerating expansion and (2) the universal geometry inferred from the cosmic microwave background. B) There are two lines of evidence: (1) the fact that the universe is expanding and (2) the observed ratio of deuterium to hydrogen. C) The only evidence comes from observations of white dwarf supernovae that indicate the expansion rate is accelerating. D) The claim comes from models of the Big Bang, but it is not backed up by any observational evidence.
Ammonia, NH3, boils at a higher temperature than phosphine, PH3 . This is probably due to
a. ammonia being more dense than PH3. b. ammonia having the lower formula mass. c. hydrogen bonding among the NH3 molecules. d. ammonia being ionic and phosphine being covalent.
Amateur astronomers have contributed to the understanding of impact events on Jupiter
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A mass of 4.5 kg, resting on a horizontal frictionless surface, is attached on the right to a horizontal spring with spring constant 29 N/m and on the left to a horizontal spring with spring constant 60 N/m. If this system is moved from equilibrium, what is the effective spring constant?
a. –31 N/m b. 31 N/m c. 89 N/m d. –89 N/m e. 16 N/m