In dispersion-strengthened metals, the strength and elastic modulus of the alloy are proportional to the _________fraction of the dispersion.
Fill in the blank(s) with the appropriate word(s).
volume
Physics & Space Science
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All RR Lyrae stars are about 5 times the Sun's luminosity
Indicate whether the statement is true or false
Physics & Space Science
The apparent path that the Sun traces annually along the celestial sphere is known as the ______________
Fill in the blank(s) with correct word
Physics & Space Science
Applications to Astronomy: What is the parallax angle for Proxima Centauri, which is Earth's nearest star at 4.3 ly? The earth's orbit has a mean radius of 1.5 × 108 km, and 1 ly = 9.46 × 1015 m.
A. 1.2 × 10-14 degrees B. 2.1 × 10-4 degrees C. 1.2 × 10-7 degrees D. 2.1 × 10-7 degrees
Physics & Space Science
Science is concerned mainly with the
A) natural world. B) spiritual world. C) difference between right and wrong. D) search for eternal truths.
Physics & Space Science