A series of n uncharged concentric spherical conducting shells surround a small central charge q. The potential at a point outside the nth shell, at distance r from the center, and relative to V = 0 at ?, is
A.
.B.
.C.
.D.
.E.
.Answer: C
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The force fo static friction between two surfaces is parallel to the surface of contact, and in in the direction that opposes relative motion
Indicate whether the statement is true or false
Which have the longest wavelengths when traveling in a vacuum?
A) radio waves B) light C) X-rays D) all the same
A star that is twice as hot as another has twice the
A) Celsius temperature. B) Fahrenheit temperature. C) Kelvin temperature. D) all of the above E) none of the above
Which of the following best describes the predominant scientific view of the origin of life on Earth?
A) We may never know precisely how life arose, but current evidence suggests that life probably can arise naturally under the conditions that prevailed on the early Earth. B) Life probably migrated to Earth from some other world. C) Life arose through a series of extremely unlikely chemical coincidences, making it seem almost miraculous that life ever came to exist at all. D) We can describe with great certainty the precise steps by which life arose on Earth.