For an oxide to be protective, the ratio of the volume of the oxide formed to the volume of the metal atoms that formed the oxide should be approximately _________.
Fill in the blank(s) with the appropriate word(s).
one
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The most abundant gas in the atmosphere is
a. oxygen. b. nitrogen. c. water vapor. d. carbon dioxide.
Series Resonance: A series RLC circuit has a 100-? resistor, a 0.100-?F capacitor and a 2.00-mH inductor connected across a 120-V rms ac voltage source operating at 1000/? Hz. What is the resonant frequency of this circuit?
A. 70.7 kHz B. 17.9 kHz C. 22.5 kHz D. 35.3 kHz E. 11.3 kHz
On a cosmic calendar, in which the history of the universe is compressed into 1 year, when did Kepler and Galileo first discover that we live on a planet in a solar system?
A) 1 second ago B) 1 day ago C) 1 week ago D) December 25 E) December 30
Which of the following statements about electron degeneracy pressure and neutron degeneracy pressure is true?
A) The life of a white dwarf is an ongoing battle between electron degeneracy pressure and neutron degeneracy pressure. B) Both electron degeneracy pressure and neutron degeneracy pressure help govern the internal structure of a main-sequence star. C) Electron degeneracy pressure is the main source of pressure in white dwarfs, while neutron degeneracy pressure is the main source of pressure in neutron stars. D) In a black hole, the pressure coming from neutron degeneracy pressure is slightly greater than that coming from electron degeneracy pressure.