For the 7075-T6 alloy in Figure 11.23, the probability of surviving 106 cycles with a stress amplitude of 210 MPa is equal to
(a) 99 %
(b) 90 %
(c) 50 %
(d) 10 %
(a) 99 %
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Which of the following describes what will happen to a light ray incident on a glass-to-air boundary at greater than the critical angle?
a. partial reflection, total transmission b. total transmission c. total reflection d. partial reflection, partial transmission
The cores of the terrestrial worlds are made mostly of metal because
A) the terrestrial worlds as a whole are made mostly of metal. B) metals sunk to the centers a long time ago when the interiors were molten throughout. C) the core contained lots of radioactive elements that decayed into metals. D) over billions of years, convection gradually brought dense metals downward to the core.
The Group 7A element astatine (85At) would be predicted to occur in what phase?
a. Liquid b. Solid c. Plasma d. Gas
Certain types of sunglasses are very effective at diminishing light reflected from surfaces because of
a. interference. b. diffraction. c. specular reflection. d. diffuse reflection. e. polarization.