A circular aluminum tube of length L 5 650 mm is loaded in com-pression by forces P. The outside and inside diameters are 80 mm and 68 mm, respectively. A strain gage on the outside of the bar records a nor-mal strain in the longitudinal direction of 400 3 1026. The shortening of the bar is approximately:
(A) 0.12 mm
(B) 0.26 mm
(C) 0.36 mm
(D) 0.52 mm
(B) 0.26 mm
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Radioactive Decay: Americium-243 has a decay constant of 9.39 × 105 years-1. How long will it take for a sample of americium-243 to lose one-third of its nuclei?
A. 2960 s B. 10.6 × 103y C. 4.32 × 103 y D. 6.44 × 103 y E. 7.84 × 103 y
Which dominated Galileo's method of extending knowledge: Philosophical discussion or experiment?
The processes responsible for virtually all surface geology are
A) convection, conduction, and radiation. B) impact cratering, volcanisms, tectonics, and erosion. C) accretion, differentiation, and radioactive decay. D) eruptions, lava flows, and outgassing.
The quantity 0.00325 × 10-8 cm is equivalent to
A) 3.25 × 10-12 mm. B) 3.25 × 10-11 mm. C) 3.25 × 10-10 mm. D) 3.25 × 10-9 mm. E) 3.25 × 10-8 mm.