The radio lobes of active galaxies can span ________ of light-years
A) tens B) hundreds C) thousands D) millions E) billions
D
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The greater proportion of energy immediately converted to heat rather than light occurs in
A) a fluorescent lamp. B) an incandescent lamp. C) both of these D) neither of these
If a is acceleration, v is velocity, x is position, and t is time, then which equation is not dimensionally correct?
a. t = x/v b. a = v2/x c. v = a/t d. t2 = 2x/a
A hot piece of iron is thrown into the ocean and its temperature eventually stabilizes. Which of the following statements concerning this process is correct? (There may be more than one correct choice.)
A) The change in the entropy of the iron-ocean system is zero. B) The entropy gained by the iron is equal to the entropy lost by the ocean. C) The entropy lost by the iron is equal to the entropy gained by the ocean. D) The ocean gains more entropy than the iron loses. E) The ocean gains less entropy than the iron loses.
The triple alpha process produces energy by fusing ________ into ________.
A. carbon and nitrogen; cyanogen B. oxygen and carbon; carbon dioxide C. helium; carbon D. oxygen; carbon E. hydrogen; helium