jadabecute3739
25.10.2019 •
Physics
Ahole of diameter d = 0.25 m is drilled through the center of a solid block of square cross section with w = 1 m on a side. the hole is drilled along the length, l = 2 m, of the block, which has a thermal conductivity of k = 150 w/m ⋅ k. the four outer surfaces are exposed to ambient air, with t[infinity],2 = 25°c and h2 = 4 w/m2 ⋅ k, while hot oil flowing through the hole is characterized by t[infinity],1 = 300°c and h1 = 50 w/m2 ⋅ k. determine the corresponding heat rate and surface temperatures.
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Ответ:
Squeeze certain precious stones (such as quartz) and you'll make electricity stream through them. ... Piezoelectricity (moreover called the piezoelectric impact) is the appearance of an electrical potential (a voltage, in other words) across the sides of a gem after you subject it to mechanical push (by squeezing it).
Explanation:
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