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Thermopane window consists of two 6 -mm thick glasses separated by a stagnant air space of thickness 6 mm. The thermal conductivity of the glass is kg = 0.78 W/mK and that of the air can be taken as ka = 0.025 W/mK. The convection coefficient for the inside and outside air for the window are hi = 10 and ho=60 W/m2K. Determine the rate of heat loss per square meter of the glass surface for a temperature difference of 40degreeC between the inside and outside air. Compare this result with the heat loss if the window had a single pane of glass of thickness L = 6 mm only instead of the Thermopane.
a package is dropped from the plane which is flying with a constant horizontal velocity of va150fts. determine the
an aqueous homogeneous reactor is composed of a homogeneous mixture of uranium nitrite uo2no32 2.81 gcm3 and heavy
what is the specific heat of air in US customary units given that its value in SI units is approximately 1 kN.m/kg.K?
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in the rectangle in the drawing a charge is to be placed at the empty corner to make the net force on the charge at
a 600 mw coal-fired power plant has an overall thermal efficiency of 38. it is burning coal that has a heating value of
The school cafeteria has found that they go through 9 sandwiches for every 6 tickets they sell to the students. Today they have 558 sandwiches available. How many lunch tickets can they sell today?
a 200-kg 5-m-wide rectangular gate shown innbspthe figure is hinged at b and leans against thenbspfloor at a making an
Name products that are manufactured using these processes and write two sentences on why you know it's made from this process.
determine the electrical power input to the pump. the density of water is 1kg/l.
problem 1 a 10-minute experimental run shows that 75 of liquid reactant is converted to product by a half-order rate.
The Brayton cycle shown in figure 6.41 operates using CO2 as a working fluid with compressor and turbine isentropic efficiencies of 1.0. Calculate the thermal efficiency of this cycle when the working fluid is modeled.
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