What type of galaxy was observed by Tully and Fisher?
A spiral galaxy.
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A mountain that floats on the mantle indicates that the density of the mantle is
A) less than that of the mountain. B) about the same as that of the mountain. C) greater than that of the mountain. D) none of the above
What is the resonance frequency of a series ac circuit consisting of a 40.0 ?F capacitor, a 55-? resistor, and a 0.030 H inductor?
A) 0.15 kHz B) 0.9 kHz C) 6.9 kHz D) 6 kHz
A charge, +Q, is placed inside a balloon and the balloon is inflated. As the radius of the balloon r increases the number of field lines going through the surface of the balloon:
a. increases proportional to r2. c. stays the same. b. increases proportional to r. d. decreases as 1/r.
A quantity that measures the opposition to the flow of charge is __________
Fill in the blank(s) with correct word