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A solar collector design consists of an inner tube enclosed concentrically in an outer tube that is transparent to solar radiation. The tubes are thin walled with inner and outer diameters of 0.10 and 0.15 m, respectively. The annular space between the tubes is completely enclosed and filled with air at atmospheric pressure. Under operating conditions for which the inner and outer tube surface temperatures are 70 and 30°C, respectively, what is the convective heat loss per meter of tube length across the air space?
What is the compressibility exponent for the cake if the resistance of the filter medium is negligible?
Give the approximate minimum temperature at which it is possible to austenitize each of the following iron-carbon alloys during a normalizing heat treatment:
The cost of baking a cake is $6, and demand is estimated to be normally distributed, with a mean of 25 and a standard deviation of 4. What is the optimal stocking level?
Assuming the PCM melts to form an expanding concentric liquid region about the heated tube such as the one shown in the schematic, determine how long it takes to melt half of the PCM.
Calculate the extent of reaction, and using that value, determine the initial amounts of CO and Cl2 that were used in the reaction.
Use the total energy of charge distribution to calculate the total electrostatic energy of a uranium 235 nucleus. It has 92 protons and a radius of about 7.0 femtometers?
For a gain of 0.5, derive the gain margin and phase margin of the systems of Problem 4.6 analytically. Let T =5 1 with no loss of generality because the value of ωT in radians is all that is needed for the solution.
In assessing the success of these programs, it's important tokeep the entire life cycle of ethanol fuels in mind. a. Up to 10% by volume of gasoline in theU.S. may consist of corn-based ethanol. Using this information, calculate the amount of crud..
Draw the marginal cost curve and the average total cost curve for a typical firm,and explain why these curves cross where they do
Chemicals for Indoor Concrete Flooring, - indoor concrete maintenance chemicals used on indoor concrete flooring
During the research that led to production of the two atomic bombs used against Japan in World War II, different mechanisms for obtaining a supercritical mass of fissionable material were investigated.
A solution of sodium hydroxide leaves a dissolver at 80ŽC and is to be cooledto 40ŽC, using cooling water.
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