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A mixture of methane and air is flammable only if the mole percent of methane is between 5% and 15%. A mixture containing 9 mole% methane in air flowing at 700 kg/hr is diluted with a stream of pure oxygen to reduce the methane concentration to the lower flammability limit. Calculate the required oxygen flow rate in mol/hr and the resulting mass fractions of methane and oxygen in the product stream. Air may be considered to be 21 mol% O2 and 79 mol% N2 and to have an average molecular weight of 29.0.
water is to be pumped from a dam to a storage tank 20 m above at a rate of 70 ls. the electric power needed to achieve
a vehicle a is stuck on the railroad tracks as a train b approaches with a speed of 120 kmh. as soon as the problem is
a polymer component that needs to maintain a stress level above 10 mpa for proper functioning of an assembly is
the 6 x 12 in timber beam has been strengthened by bolting to it thenbsp5 x ? in steel reinforcement shown. the modulus
an ideal gas at 300 k has a volume of 15 liters at a pressure of 15 atm. calculate 1 the final volume of the system 2
consider an ideal gas refrigerator using air acting between 1 and 3 bar pressure. assume that the temperature at the
determine in a steady state heat transfer through a 2.4in thick homogenous trapezodial flap with its faces maintained
the coefficients of static friction and kinetic friction 0.4, 0.30 between all surface of contact. determine the force p for which motion of the 30kg block is impending if cable AB is attached is shown and removed.
an object whose mass is 50lb is projected upward from the surface of the earth with an intial velocity of 200 fts. the
water enters a nozzle with a velocity of 0.8 ms and exits with a velocity of 5 ms. the nozzle entrance diameter is 12
the lower end of the 30 kg slender rod is displaced a small amount and released from the rest. determine the natural frequency of vibration. the springs have stiffness of 500 N/m and they are stretched when the rod is hanging vertically.
The unit cell for uranium has orthorhombic symmetry with a, b and c lattice parameters of 0.286, 0.587, 0.495 nm, respectively. If its density, atomic weight, and atomic radius are 19.05 g/cm3, 238.03 g/mol, and 0.1385 nm, respectively, compute th..
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