Which of the following strengthening processes in metals does not require the addition of foreign atoms or compounds to a pure metal?
(a) Grain boundary
(b) Dispersion
(c) Precipitation
(d) Solid solution
(a) Grain boundary
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A uniform bridge span weighs 70.0 kN and is 40.0 m long. An automobile weighing 15.0 kN is parked with its center of gravity located 15.0 m from the right pier. What upward support force does the right pier provide?
a. 40.6 kN b. 51.3 kN c. 25.6 kN d. 44.4 kN e. 42.5 kN
The region from the origin to the elastic limit on an applied force versus elongation graph for a typical metal under tension is referred to as the
A) elastic region. B) proportional region. C) plastic region. D) ultimate strength region. E) breaking region.
Why do astronomers consider gamma-ray bursts to be one of the greatest mysteries in astronomy?
A) because they are so rare B) because we know they come from pulsating variable stars but don't know how they are created C) because the current evidence suggests that they are the most powerful bursts of energy that ever occur anywhere in the universe, but we don't know how they are produced D) because current evidence suggests that they come from our own Milky Way, but we have no idea where in the Milky Way they occur E) because current evidence suggests that they come from massive black holes in the centers of distant galaxies, adding to the mystery of black holes themselves
Which spacecraft dropped a problem into the atmosphere of Jupiter in 1995?
A) Galileo B) Cassini C) Voyager 2 D) Pioneer 10