How do the escape speeds for two rockets, the first weighing 20 N and the second weighing 20,000 N compare?
A) The escape speed for the lighter rocket is smaller than that for the heavier rocket.
B) The escape speed for the lighter rocket is the same as that for the heavier rocket.
C) The escape speed for the lighter rocket is greater than that for the heavier rocket.
B
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By definition, the removal of oxygen from a compound is called
a. neutralization. b. reduction. c. oxidation. d. displacement.
One theory for the origin of life suggests that life was transported to Earth in meteorites. This is referred to as
A) naturism B) intelligent design C) panspermia D) chemical evolution
Which of these is true of planetary nebulae?
A) They are the material which causes the eclipses in eclipsing binary systems. B) They are rings of material around protostars that will accrete into planets in time. C) They are the envelopes that form when blue stragglers merge. D) They are expelled by the most massive stars in their final stages before supernova. E) They are ejected envelopes surrounding a highly evolved low-mass star.
Which chemical elements were created during the first few minutes of the "big bang" that started our universe?
A) All 92 of the naturally-occurring chemical elements. B) Only the elements through iron in the periodic table, i.e., only elements 1 through 26. C) Only the first three elements: hydrogen, helium, and lithium. D) Only the heaviest elements, having atomic numbers higher than that of lead. E) No elements were produced during the big bang--all the normal chemical elements were produced much later.