Which living organisms most resemble the common ancestor of all life according to genetic testing?
A) bacteria such as E. coli
B) organisms living deep in the oceans around seafloor volcanic vents and in hot springs
C) plankton that use sunlight as an energy source through photosynthesis
D) viruses
E) stromatolites
B
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When 0.50 kg of water at 0°C freezes, what is the change in entropy of the water? The latent heat of fusion of water is 33,400 J/kg
A) 0 J/K B) -17,000 J/K C) -610 J/K D) 17,000 J/K E) 610 J/K
Before about 4 billion years ago the universe was:
A) radiation dominated. B) quark dominated. C) lepton dominated. D) matter dominated. E) dark energy dominated.
Constant Acceleration Kinematics: An object is moving in a straight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?
A. 30 m B. 39 m C. 48 m D. 57 m
What is the likely source of lunar ice?
A) water that was present when the Moon formed B) contamination from human exploration of the Moon C) volcanism earlier in the Moon's history D) impacts of meteoroids and comets