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A 3-ft-diameter duct is used to carry ventilating air into a vehicular tunnel at a rate of 9000 ft3 /min. Tests show that the pressure drop is 1.5 in. of water per 1500 ft of duct. What is the value of the friction factor for this duct and the approximate size of the equivalent roughness of the surface of the duct?
Diffusion Coeffiecient, Calculate Constant, The diffusion coeffiecient for Cr^+3 in Cr2O3 is 6x10^-15 cm2/s at 727 degrees Celcius and is 1x10^-9 cm2/s at 1400 degrees Celcius.
A 10-hp, 230-V shunt-wound motor has a rated speed of 1,000 r/min and full-load efficiency of 86 percent. Armature-circuit resistance is 0.26 Q; field-circuit resistance is 225 Q. If this motor is operating under rated load and the field flux is v..
a belt driven machine has a moment of inertia 240 ft-lb-sec2. the belt tensions differ by 80 lb as the belt passes over
A desktop computer is to be cooled by a fan whose flow rate is 0.34 m3 /min. Determine the mass flow rate of air through the fan at an elevation on 3400 m, where the air density is 0.7 kg/m3. The diameter of the casing of the fan, if the average velo..
a fenced enclosure consists of a rectangle of length l and width 2r and a semicircle of radius r as shown in figure
Water initially exists as a saturated liquid at 186oC is contained in a piston-cylinder assembly. The water undergoes a process to the corresponding saturated vapor state, during which the piston moves freely in the cylinder. There is no heat transfe..
an object whose mass is 50lb is projected upward from the surface of the earth with an intial velocity of 200 fts. the
A vertical piston-cylinder device contains a gas at a pressure of 100 kPa. The piston has a mass of 5 kg and a diameter of 12 cm. Pressure of the gas is to be increased by placing some weights on the piston. Determine the local atmospheric pressure a..
tests reveal that a normal driver takes about 0.75 seconds before he or she can react to a situation to avoid a
Micro structural analysis of a slowly cooled Al-Si alloy indicates there is a 6 volume % silicon-rich proeutectic phase. Calculate the overall alloy composition (in weight percent).
Assume Complete combustion write out a stoichmetric equation for 1 mole of an arbitrary alcohol Cx Hy Oz determine the number of moles of air required to burn 1 mole of fuel?
the pressure in the steam condenser of a nuclear power plant is 1 psia. calculate the absolute pressure head the gage
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