A 120-V rms voltage at 60 Hz is applied across an inductor and a 200-? resistor. If the impedance of this circuit is 216 ?, what is the rms value of the current?
A) 0.336 A
B) 0.446 A
C) 0.556 A
D) 0.667 A
E) 0.767 A
C
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The distance between adjacent galaxies in a typical cluster is about ________ times the size of a typical galaxy
A) two or three B) five or less C) ten to twenty D) a hundred E) a thousand
The structure of most galaxies is most apparent using near-infrared images that show the locations of ____
a. dense molecular clouds b. spiral tracers c. atomic hydrogen clouds d. cool, low-luminosity stars e. hot, high-luminosity stars
The formula mass of sulfuric acid, H2SO4, is
a. 98 u. b. 100 u. c. 66 u. d. 7 u.
Jocko the clown at the top of a tall flagpole has considerable potential energy relative to the circus net below. After stepping off the pole and neglecting air resistance, his potential energy when he is half way to the net is
1) the same as at the top, 2) one quarter the amount at the top, 3) one half the amount at the top, 4) more than one-half the amount at the top, and compared to his kinetic energy when meeting the net, his kinetic energy at the half-way point is 5) one half. 6) the same as his potential energy at the half-way point. 7) both of these 8) neither of these