_________corrosion is the dissolution of a metal that occurs when it is electrically connected to a more noble metal in an electrolyte.
Fill in the blank(s) with the appropriate word(s).
Galvanic
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How old is the Universe since the big bang? Pick the best answer according to radioactive dating in the solar system, light travel times to most distant galaxies, time reversal of the big bang, and observations of the 3-K radiation
a. 1400 years b. 14,000 years c. 14,000,000 years d. 14,000,000,000 years
Four equal positive charges are placed at the corners of a square. The force on a +1 C charge placed at the center due to any single charge is 10 N. The value of the electric field at the center due to the charges at the corners is ________ N/C.
Fill in the blank(s) with the appropriate word(s).
The graph above shows 4 models for how the average distance between galaxies could change with time, from the past (left) to now (middle) to the future (right-hand side). The graph also shows real data, based on white dwarf supernovae. Which model predicts that galaxies had the largest separations in the past?
A) accelerating B) coasting C) critical D) recollapsing
Series Resonance: An ac circuit has a 100-? resistor in series with a 4.9-?F capacitor and a 700-mH inductor. At what frequency does the circuit act like a pure resistance?
A. 0.29 MHz B. 1.9 MHz C. 12 MHz D. 0.54 kHz E. 86 Hz