Give an example of a practical problem in which the variation of thermal conductivity with temperature is significant and for which a numerical solution is therefore the only viable solution method.
What will be an ideal response?
the thermal conductivity of stainless steel (either 304 or 316) is a fairly strong
function of temperature. For example
which is about a 38% difference.
Suppose a stainless steel sheet is to receive a heat treatment that involves heating the sheet to 500°C
and then plunging it into a water bath. The water near the sheet would probably boil producing a sheet
surface temperature near 100°C while the interior of the sheet would be at 500°C, at least for a short
time. One would expect the large variation in thermal conductivity to be important in this type of
problem.
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A small object is enclosed in plastic (n = 1.5). The object appears to be 4.0 cm below the surface. What is the actual distance of the object below the surface?
A. 2.0 cm B. 2.7 cm C. 4.0 cm D. 5.5 cm E. 6.0 cm
A laser beam (? = 694 nm) is incident on two slits 0.100 mm apart. Approximately how far apart (in m) will the bright interference fringes be on the screen 5.00 m from the double slits?
a. 3.47 × 10^?3 b. 3.47 × 10^?2 c. 3.47 × 10^?4 d. 3.47 × 10^?6 e. 3.47 × 10^?5
A reaction that absorbs energy from the surroundings is called
a) activated. b) exothermic. c) reversible. d) endothermic.
A sample of highly-radioactive material is somewhat
A) warmer than the environment. B) cooler than the environment. C) neither of these