Bainite is formed by the following procedure with a eutectoid composition carbon steel starting at 800°C (1472°F):
(a) Quench to 500°C (932°F), then hold for 100 seconds, then cool to room temperature.
(b) Quench to 600°C (1112°F), then hold for 100 seconds, then cool to room temperature.
(c) Quench to 700°C (1292°F), then hold for 100 seconds, then cool to room temperature.
(d) Quench to room temperature in 10 seconds.
(a) Quench to 500°C (932°F), then hold for 100 seconds, then cool to room temperature.
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Resistance and Resistivity: The figure shows a graph of the resistance of a wire as a function of its length. What physical quantities does the slope of this graph represent?
A. the cross-sectional area of the wire B. the resistivity of the material of which the wire is made C. the product of the resistivity and the cross-sectional area of the wire D. the resistivity of the material divided by the cross-sectional area of the wire E. the reciprocal of the resistivity of the material
A total impedance of an RC circuit with a capacitance of 40.0 ?F is 800 ?. If the frequency of the applied ac voltage is 18.0 Hz, what is the resistance of the circuit?
A) 569 ? B) 669 ? C) 769 ? D) 869 ? E) 800 ?
Germanium, Ge (number 32), computer chips operate faster than silicon, Si (number 14), computer chips. So how might a gallium, Ga (number 31), chip compare with a germanium chip?
A) A gallium chip would be even faster because the gallium is more metallic. B) A gallium chip would be slower because its electrons are more loosely held. C) Gallium is located just below aluminum, which is widely known to be an electrical insulator. D) Gallium is more nonmetallic and so it does not conduct electrons very well.
A 25 cm focal length mirror has a 3.0 cm tall object placed 20 cm in front of it. Where is the image, and is it real or virtual?
A. 5.0 cm behind the mirror, virtual B. 11 cm in front of the mirror, real C. 100 cm in front of the mirror, real D. 100 cm behind the mirror, virtual E. 45 cm behind the mirror, virtual