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A slab of dry wood of 4-in. thickness and sealed edges is exposed to air of 40% relative humidity. Assuming that the two unsealed faces of the wood immediately jump to an equilibrium moisture content of 10 lb H2O per 100 lb of dry wood, determine the time for the moisture to penetrate to the center of the slab (2 in. from either face). Assume a diffusivity of water in the wood as 8.3?10?6 cm2/s.
acetyl chloride is a colorless fuming liquid used primarily in the chemical industry.a how is acetyl chloride produced?
An electric motor under steady load draws 9.7 amperes at 110 volts; it delivers 0.93 Kw of mechanical energy. The temperature of the surroundings is 300 K. What is the total rate of entropy generation in W K-1?
the reaction rates of all the elementary reactions of type (ii) in a weakly realistic mechanism are linear functions of all the concentrations separately.
Calculate the ?S for the transfer of one mole of octane to water using the change in multiplicities assumed for the first shell of water molecules surrounding the molecules.
Which of the three variables above currently limits the EQE of quantum dot-based LEDs to about 1%? Why are all-inorganic devices desirable rather than hybrid organic-inorganic devices?
The core loss at rated voltage is 45 W, and the copper loss at rated load is 100 W. Neglect the exciting current of the transformer. Find the per-unit voltage regulation when the transformer is supplying full load at 110 V and 0.9 lagging power fa..
Carolina (H2C=CHCHO) is made by selective oxidation of propylene at 2 bar, 350 °C using a molybdenum, iron, and bismuth catalyst on a silica support
2.8 g of N2 gas at 300 k and 20 atm was allowed to expand isothermally against a constant external pressure of 1 atm. calculate del E ,q and W for the gas.
A closed insulated cylinder is divided into parts by a piston that is held into place by latches. One compartment is evacuated, the other contains steam at 7.5 bar, 300 °C. The latches are removed and the gas expands to fill the entire volume of t..
Which of the following particle sizes are considered as nanoparticles?
50. Methanol is synthesized from carbon monoxide and hydrogen in a catalytic reactor. The fresh feed to the process contains 32.0 mole% CO, 64.0% H2, and 4.0% N2. This stream is mixed with a recycle stream in a ratio S mol recycle/1 mol fresh feed to..
The force plate in Figure 4.9 is 70 cm by 70 cm square. At a particular instant of the gait cycle each transducer reads F1 ¼ 210 N, F2 ¼ 220 N, F3 ¼ 150 N, and F4 ¼ 180 N. Compute the resultant force and its location.
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