Alumina (Al2O3) is a(n) ______________material.
Fill in the blank(s) with the appropriate word(s).
ceramic
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What do we mean by the "fossil record"?
A) rocks from earlier periods of the Earth's history B) samples of meteorites that fell to Earth early in its history C) remains of ancient organisms preserved in rocks D) an album by the Rolling Stones
A 4.50-kg wheel that is 34.5 cm in diameter rotates through an angle of 13.8 rad as it slows down uniformly from 22.0 rad/s to 13.5 rad/s. What is the magnitude of the angular acceleration of the wheel?
A) 0.616 rad/s2 B) 5.45 rad/s2 C) 111 rad/s2 D) 22.5 rad/s2 E) 10.9 rad/s2
Solid solution strengthening is _________with designs that require the part to be heated during fabrication by processes such as welding or hot working.
Fill in the blank(s) with the appropriate word(s).
The Milky Way:
A) contains less than 50 billion stars. B) stretches across for just around 30,000 light-years. C) is known for being very unique. D) is larger than most other galaxies.