Which of the following would be the least conductive?
a. Copper
b. Salt water
c. Glass
d. Mercury
c
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The ____ occurs when a rapidly rotating conductor is stirred by convection to produce a magnetic field
a. dynamo effect b. Zeeman effect c. Babcock effect d. proton-proton chain e. aurora
A bird can safely land on a bare high voltage power line because
A. If both feet are touching the bare wire, they are at the same potential – and therefore no current can flow between the feet and through the bird’s body B. Its internal resistance is very high, so very little current will flow C. The line cannot deliver enough current to harm it D. Its feet are good insulators, and therefore it is protected
The "surface" of a black hole is known as the _______________
a. core b. corona c. photosphere d. event horizon
The resetting of a mineral's time clock means that
A) a mineral can be formed and reformed again and again. B) the date obtained will be the date of the metamorphic event, not the date of the rock's formation. C) the date obtained will be the date of the rock's formation, not the date of the metamorphic event. D) minerals can tell time just like a clock can tell time.