By what factor is the self-inductance of a solenoid changed if only its cross-sectional area, A, is doubled?
a. 1/2
c. 2
b. 4
d. 8
C
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The surface of Mercury resembles the Moon's surface in that they are both ________.
A. covered with volcanoes B. eroded by wind C. heavily cratered D. newly resurfaced
What do we mean by the observable universe?
A) the part of the universe that we can see with the naked eye B) the part of the universe that we can see through telescopes C) the part of the universe that could be observed in principle, including things that may require future technologies D) the compendium of all objects that we have observed to date E) the entire universe, since it is inconceivable that there could be parts of the universe that we cannot observe
Two spaceships are approaching one another, one with speed v1 and the other with speed v2 . Neither speed is 0 . Their speed of approach, according to Newtonian mechanics, is v1 + v2 . Special relativity tells us that the speed of approach
a. is more than the Newtonian value if each speed is more than half the speed of light. b. is always greater than the Newtonian value. c. is the same as the Newtonian value if each speed is less than half the speed of light. d. is always less than the Newtonian value.
How is the energy stored in a current-carrying inductor related to its self-inductance, L?
a. directly proportional to L1/2 c. inversely proportional to L b. directly proportional to L d. directly proportional to L2