Consider the person described in problem N3T.6. The person’s trajectory will look most like which of the following? (The dot shows the person’s position at t = 0 and east is to the right and north to the top.)
A. A
B. B
C. C
D. D
E. E
F. F
D. D
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A(n) _________is a device that allows the angle of a sample relative to a reference to be changed and measured.
Fill in the blank(s) with the appropriate word(s).
A beam of protons in an accelerator incident on a metal plate carries a current of 150 ?A. How many protons strike the plate in 24.0 s?
a. 1.60E+5 b. 3.60E+9 c. 2.25E+16 d. 3.91E+13
Nebula that tend to be reddish in color are the
A) emission nebula. B) reflection nebula. C) dark nebula. D) magenta nebula.
You discover a binary star system in which one member is a 15MSun main-sequence star and the other star is a 10MSun giant. Why should you be surprised, at least at first?
A) It doesn't make sense to find a giant in a binary star system. B) The odds of ever finding two such massive stars in the same binary system are so small as to make it inconceivable that such a system could be discovered. C) The two stars in a binary system should both be at the same point in stellar evolution; that is, they should either both be main-sequence stars or both be giants. D) The two stars should be the same age, so the more massive one should have become a giant first. E) A star with a mass of 15MSun is too big to be a main-sequence star.