From first to last, name the eons on the Geologic Time Scale
A) Phanerozoic, Proterozoic, Archean, Hadean.
B) Hadean, Archean, Proterozoic, Phanerozoic.
C) Proterozoic, Phanerozoic, Hadean, Archean.
D) Precambrian, Phanerozoic, Proterozoic, Paleozoic.
Answer: B
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In a given frictionless displacement of a particle, its kinetic energy increases by 25 J while its potential energy decreases by 10 J. Determine the work of the nonconservative forces acting on the particle during this displacement
a. ?15 J b. +35 J c. +15 J d. ?35 J e. +55 J
How much electromagnetic energy is contained in each cubic meter near the Earth's surface if the intensity of sunlight under clear skies is 1000 W/m2?
a. 3.3 × 10^?6 J b. 3.3 J c. 0.003 J d. 10?4 J e. 3.0 × 10^5 J
When TOTAL REFLECTION occurs at a surface, the incident angle must be in the substance with the higher
A) speed of light. B) index of refraction. C) incident angle. D) c/n.
Why doesn't a small piece of uranium go naturally into a chain reaction?
a. Because none of its nuclei fission without bombardment from human-controlled sources. b. Because only large chunks of uranium do this naturally. c. Because in a small sample, too small a fraction of neutrons released from each fission are captured to trigger another reaction. d. Because a small piece of uranium is mostly uranium-238. e. Because even a small chunk is too large to sustain a chain reaction.