A zero decibel sound level
a. has zero amplitude c. is just at the threshold of hearing.
b. is nonsense d. none of the above
C
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Aluminum (Group III) and silicon (Group IV) are adjacent to each other in the periodic table. Relative to aluminum silicon is less dense, has a higher melting temperature, is harder, and is very prevalent in the sand and rocks of the Earth’s crust. And yet aluminum has many more mechanical applications, such as in the structure and skin of aircraft, the cylinder heads in automobile engines, small boats, and marine engines. We will cover this later in the book, but from what you know about metals, such as aluminum, what property results in the use of aluminum in these applications rather than silicon?
What will be an ideal response?
Two thin cables, each having a diameter of d 5 t/6 and carrying tensile loads P, are bolted to the top of a rectangular steel block with cross-sectional dimensions b 3 t. The ratio of the maximum tensile to compressive stress in the block due to loads P is:
(A) 1.5
(B) 1.8
(C) 2.0
(D) 2.5
Dry air has a density of 1.29 kg/m3 . What would be the volume of a metric ton of air?
How does the calculated value of the age of the universe vary as the value of Hubble's constant increases?