A crack is 1 mm long and has a 1-nm radius of curvature at the crack tip. What is the magnitude of the stress concentration factor for this crack?
(a) 2
(b) 20
(c) 200
(d) 2000
(d) 2000
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Waves emitted by the Sun and terrestrial wave emissions are
A) the same except for their frequencies and wavelengths. B) entirely different kinds of waves. C) identical.
Early AM radios required very long antennae wires. FM antennae are often approximately a meter in size. Can you surmise why sensitive FM aerials are much smaller than those AM wires?
What will be an ideal response?
Which scientists played a major role in overturning the ancient idea of an Earth-centered universe, and about when?
A) Copernicus, Kepler, and Galileo; about 400 years ago B) Aristotle and Copernicus; about 400 years ago C) Newton and Einstein; about 100 years ago D) Huygens and Newton; about 300 years ago E) Aristotle and Plato; about 2,000 years ago
After four half-lives, the surviving tritium atoms are removed. Compared to completely new tritium atoms, they are expected to live
A. 1 /8 as long B. 1/4 as long C. 1 /2 has long D. exactly as long