A satisfactory model of the transverse strength of uniaxial composite materials is to assume that the fibers are _________in the composite material.
Fill in the blank(s) with the appropriate word(s).
holes
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Which statement correctly locates the formation of the Earth and the appearance of the first humans on the cosmic calendar, which compresses the 14-billion year history of the universe into one "year," where "now" is exactly midnight,
A) Earth forms in January, life begins in April, and humans appear in early December. B) Earth forms in January, life begins in September, and humans appear in October. C) Earth forms in early September, life begins in late September, humans appear a few hours before midnight, Dec 31. D) Earth forms in early September, life begins in November, and humans appear on Dec 15.
Spherical Mirrors: Which statements about images are correct? (There could be more than one correct choice.)
A. A virtual image cannot be formed on a screen. B. A virtual image cannot be viewed by the unaided eye. C. A virtual image cannot be photographed. D. A real image must be erect. E. Mirrors always produce real images because they reflect light.
What is meant by the idea life on Earth had an "interstellar origin"?
What will be an ideal response?
If the polar ice caps melted and flowed toward the equator, the rotation of Earth would tend to
1) decrease in angular speed, 2) be unchanged, 3) increase in angular speed, with the result that the day would be 4) slightly longer. 5) slightly shorter. 6) unaffected.