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Heat is to be conducted along a circuit board that has a copper layer on one side. The circuit board is 15 cm long and 15 cm wide, and the thicknesses of the copper and epoxy layers are 0.1 mm and 1.2 mm, respectively. Disregarding heat transfer from side surfaces, determine the percentages of heat conduction along the copper (k = 386 W/°C) and epoxy (k = 0.26 W/m °C) layers. Also determine the effective thermal conductivity of the board.
the rods ab and cd each have a 30-mm diameter and are 1m long. the modulus of the rods is 28 gpa. the rods are
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A 7 kg cylinder is attached to a series of two springs in the attached illustration. If the cylinder is released from rest - when the springs are both un-stretched - determine the maximum stretch in each spring.
steam at 25 psia and 250degf is condensed at its saturation temperature. what is the temperature of the condensate? how
What is the composition, in atom percent, of an alloy that consists of 5.5 wt% Pb and 94.5 wt% Sn?
consider the surface of a solid that is at an elevated temperature and exposed to cooler surroundings. by what modes is
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an inventor claims to have developed a refrigeration unit that maintains a cold space at -10degc while operating in a
a straight duct with a radius of 40 cm contains a fan that is operating at steady state. the fan draws air from the
an inventor claims to have developed a device that takes an air stream at 20degc 274 kpa and produces two separate
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