A wire has resistance R. A second wire has twice the length, twice the diameter, and twice the resistivity of the first wire. What is its resistance?
a. 8R
b. R
c. R/4
d. The resistance is not given.
b
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Fill in the blank(s) with correct word
Meanders
A) migrate downstream. B) shorten the stream. C) migrate upstream. D) remain in one place.
When we see a meteor shower, it means that ________
A) an Earth-approaching asteroid has recently come very close to our planet B) you should duck and run for cover to avoid being blasted on the head by a rock from space C) the solar wind is unusually strong D) Earth is crossing the orbit of a comet
It takes 10 J of work to push a charge initially at rest into an electric field. If the charge is then released, it flies back to its initial position with a kinetic energy of
A) zero. B) 5 J. C) 10 J. D) more than 10 J. E) need more information.