For most materials, the fatigue endurance limit is what percentage of the yield stress?
(a) 60 to 80
(b) 35 to 60
(c) 25 to 35
(d) 15 to 25
(b) 35 to 60
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Why is it difficult to use the method of standard candles to find the distance to galaxies?
A. There are no known standard candles outside of our galaxy. B. Standard candles are too bright to be used for all but the farthest galaxies. C. It is difficult to isolate the light of a single star from the galaxy. D. All of these choices are correct.
A concave mirror has a focal length F. An object that is placed in front of the mirror has an image that
A. can be upright or inverted. B. is always upright. C. is always inverted. D. depends on the magnitude of F.
Venus' rotation on its axis
A) is the fastest of the terrestrial planets. B) is clockwise, unlike most other solar system objects. C) is highly tilted to its orbital plane, causing large seasonal changes. D) shows it is tidally locked in its orbit around the Sun. E) prevents us from seeing all of its surface features.
We live in the epoch called the
a. Quaternary. b. Ordovician. c. Holocene. d. Cenozoic.