Time-dependent plastic strain is _________strain.
Fill in the blank(s) with the appropriate word(s).
creep
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Nearly all galaxies contain Cepheid variable stars. Why, then, do we determine the most distant galaxy distances using white dwarf supernovae rather than Cepheids as standard candles?
A) White dwarf supernovae are much more reliable standard candles than Cepheids. B) White dwarf supernovae can be observed in galaxies that are too far away for us to see individual Cepheids. C) White dwarf supernovae are more common than Cepheids. D) White dwarf supernovae can be detected with a single observation, while it takes many observations to measure a Cepheid's light curve.
Which of the following is quantized?
A) energy B) radiation C) number of atoms in a gold bar D) electric charge E) all of the above
Observations show that elements with atomic mass numbers divisible by 4 (such as oxygen-16, neon-20, and magnesium-24 ) tend to be more abundant in the universe than elements with atomic mass numbers in between. Why do we think this is the case?
A) The apparent pattern is thought to be a random coincidence. B) Elements with atomic mass numbers divisible by 4 tend to be more stable than elements in between. C) At the end of a high-mass star's life, it produces new elements through a series of helium capture reactions. D) This pattern in elemental abundances was apparently determined during the first few minutes after the Big Bang.
If each frame of a motion picture film is 35 cm high, and 24 frames go by in a second, estimate how many frames are needed to show a two-hour-long movie.
A. 1400 B. 25,000 C. 50,000 D. 170,000 E. This cannot be determined without knowing how many reels were used.