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Upper and lower surfaces of a bus bar are convectively cooled by air at T8 with hu ? h1. The sides are cooled by maintaining contact with heat sinks at To, through a thermal contact resistance of Rt,c The bar is of thermal conductivity k, and its width is twice its thickness L.
Consider steady-state conditions for which heat is uniformly generated at a volumetric rate q due to passage of an electric current. Using the energy balance method, derive finite-difference equations for nodes 1 and 13.
calculate the mass of the sun noting that the period of the earths orbit around the sun is 3.156 107 s and its distance
Estimate the concentration (in ppm) and the mass emission rate of NOx (in kg/hr, expressed as NO) if a coal containing 1.5% nitrogen is combusted at 1400 K using an air/fuel ratio that is 1.5 times the stoichiometric ratio.
pneumatic nail driver uses .02 ft3 of air at 100 psia and 1 btu of energy per nail must drive 500 nails with a tank no
consider an aircraft powered by a turbojet engine that has a pressure ratio of 9. the aircraft is stationary on the
two identical cars a and b are at rest on a loading dock with brakes released. car c of a slightly different style but
methane and steam are added to a reactor at 1 bar and 300 oc where the following two reactions occur isothermallych4
A mixture of propane and butane is fed into a furnace where it is mixed with air. The furnace exhaust leaves the furnace at 343°C, 780.0 mmHg and contains only N2, O2, CO2, and H2O. The partial pressure of O2 in the exhaust is 51.40 mmHg and the part..
the yield of a chamical process is being studied. from previous experience with disprocess the standart deviation of
10 ft3 of air initially at 550 0R, 100 psi undergoes a polytropic process pV1.2 = constant to a final pressure of 50 psi. The work of the process is 100 Btu. Assuming ideal gas behavior of the air, determine (a) the mass of air in lb, (b) the final v..
water flows steadily through an outflow nozzle. known conditions are d1 15 cm v1 3 ms d2 9 cm. assume that the water
if the velocity v of a paticle moving along a straight line decreases linearly with its displacement from 20ms to a
black is purchasing a house under a real estate mortagage held by the white mortgage black is obligated to make a
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