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A plywood-manufacturing concern is using a binder that requires a temeprature of 180°F in order to obtain adequate holding strength. Large slabs of the plywood at an initial uniform temperature of 70°F are placed in a heater, and the heating unit is maintained at a constant temperature. The manufacturer wishes to pass the slabs through the heater continuously at such a rate that each slab remains in the heater for 15 min. If the slabs are 1 in. thick, determine the minimum constant temperature (i.e., with negligible surface resistance) required for the heater if the temperature at the center of each slab is to reach 180°F before leaving the heater. The following average data apply to the plywood: density = 35 Ib/ft3; thermal conductivity = 0.10 Btu/(h)(ft2)(°F/ft); heat capacity = 0.50 Btu/(lb)(°F). Consider the plywood as homogeneous and isotropic.
High-density polyethylene may be chlorinated by inducing the random substitution of chlorine atoms for hydrogen.
A 184.6-mg sample of K2Cr2O7 is dissolved in enough water to make 500.0 mL of solution. c. A 0.1025-g sample of copper metal is dissolved in 35 mL of concentrated HNO3 to form Cu2 ions and then water is added to make a total volume of 200.0 mL. (C..
Find the magnitude of the force P, required by the person pushing the vehicle to give the car an acceleration of 1 ft./s^2. The coefficient of kinetic friction between the car and the street is (.25).
Develop a mathematical model that describes how the pressure in the tank varies with time.
A beaker filled with an equimolar liquid mixture of ethyl alcohol and ethyl acetate evaporates at O°C into still air at 101 kPa (1 atm) total pressure. Assuming Raoult's law applies, what will be the composition of the liquid remaining when half t..
List the types of separator that could be considered for. Bearing in mind the nature of the process, what type of separator would you recommend for this duty?separating the solids from the liquid
A civil engineer is designing a road. At what angle should he bank the road surface in a curve of radius 70m so that there is no tendency for a vehicle traveling at 90 km/h to slip sideways, either up or down the banking.
The gases enter the condenser at 230 °C and leave at 50 °C. The cooling water enters the tubes at 20 °C and leaves at 50 °C. Suggest suitable materials of construction for the shell and the tubes.
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.
Determine the molar free energy of vaporization, Delta vapG, for benzene at 75 C and 1 bar given that the molar enthalpy of vaporization of benzene at its normal boiling point of 80.09 C and 1 bar is 30.72 kJ⋅mol-1.
The feed is a saturated liquid at 330 kPa. The recovery of toluene in the distillate should be greater than 99%, and the recovery of ethylbenzene in the bottoms should be greater than 99%.
Determine the maximum layer of the hydrogel membrane that would result in an oxygen concentration of at least 1.104 mol/mL everywhere in the capsule.
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