we imagine the history of the universe compressed into one year, with the present as the stroke of midnight at the very end of that year, dinosaurs became extinct
A) about 6 months ago.
B) about 3 weeks ago.
C) yesterday morning.
D) about an hour ago.
C) yesterday morning.
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The speed of a bullet fired from a gun will be about the same as the speed of the recoiling gun
A) when momentum is conserved. B) because velocity is conserved. C) when both velocity and momentum are conserved. D) if the masses of the bullet and gun are equal. E) none of the above
A steel piano string is attached, under tension, at each end to secure posts. When gently struck, a faint note can be detected coming from the string. The string is then cooled by blowing cold air over it and then is struck again. How does the note now detected compare to the previous one
a. It is the same since the posts don't move. b. It is at a higher frequency than the original one. c. It is at a lower frequency than the original one. d. More than one answer is correct.
All of the following are base units of the SI system except:
A) kilogram. B) kelvin. C) meter. D) volt. E) candela.
Divergent boundaries are areas of
A) tensional forces that stretch the crust and generate a spreading center. B) compressional forces that crunch the crust and generate a spreading center. C) compressional forces that crunch and shorten the crust by folding and faulting. D) plate collision.