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Consider heat transfer through a wall comprised of two solid layers, each 4m x 4m. When perfect contact is maintained between the layers, the steady state temperature profile across the wall might look like that shown below, in Figure 1. If the layers are not in perfect contact, the steady state temperature profile might look like that shown below in Figure 2. For the case of Figure 2, assuming that the bulk temperature in the air gap equals the average of the temperatures at each solid surface in contact with it, what is the temperature drop from surface 1 to surface 2? The product of the Grashof and Prandtl numbers evaluated in the air gap is 106, and the thermal conductivity of air can be taken as 0.028 W/m °C
What value of G makes the two series of cash flows described below equivalent at an interest rate of 3% per year, compounded every 3 months? 22 annual deposits in the amount of $400. 11 annual deposits in the amount of $400 in the first year, and inc..
how much work must be done by a carnot refrigerator to transfer 1.0 j as heat a from a reservoir at 1.1degc to one at
Air at 300 kPa, 63oC, and a velocity of 423 m/s enters an insulated duct of varying cross-sectional area. The air exits at 150 kPa, 88oC. At the inlet, the cross-sectional area is 6.57 cm^2.
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A Crate containing 40 bricks, each of mass 1.3kg, is placed on a storage framework as shown. Calculate the reaction force in each of the supports A and B. Calculate the moment of the force exerted by the crate around support A and the moment of the f..
a double acting hydraulic cylinder rod diameter frac34 inches is used to compress garbage. this operation requires a
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