A series LR circuit includes a 9.0. V battery, a resistance of 0.500 
and an inductance of 0.800 H. What is the greatest energy stored by the inductor after the switch is closed?
A. 33.0 mJ
B. 13.0 mJ
C. 130 J
D. 65.0 J
E. 33.0 J
C. 130 J
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An oven has inside walls with emissivity of 0.6. When the oven is at 200ºC the door is opened and the oven is turned off, as shown in the figure. Determine the net radiation from the oven to the surrounding room. Assume that the room acts as a black body at 20ºC.
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.
Instead of thymine, RNA uses the nucleotide base
A) guanine B) uracil C) adenine D) cytosine
Fission is used in
a. atomic bombs b. power plants c. energy for stars d. hydrogen bombs e. a tokamak reactor