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A thin-walled tube with a diameter of 6 mm and length of 20 m is used to carry exhaust gas from a smoke stack to the laboratory in a nearby building for analysis. The gas enters the tube at 200°C and with a mass flow rate of 0.003 kg/s. Autumn winds at a temperature of 15°C blow directly across the tube at a velocity of 5 m/s. Assume the thermophysical properties of the exhaust gas are those of air.
(a) Estimate the average heat transfer coefficient for the exhaust gas flowing inside the tube.
(b) Estimate the heat transfer coefficient for the air flowing across the outside of the tube.
(c) Estimate the overall heat transfer coefficient U and the temperature of the exhaust gas when it reaches the laboratory.
you have a bevel gear and shaft and you have to find the maximum load that can be applied on it. what type of
A brass rod is stress free at room temperature (20 Deg. C) It is then heated up, but prevented from lengthening at its ends by external forces. At what temperature does the stress in the rod reach -172 MPa? Assume the modulus of elasticity is 100 GPa..
a projectile is fired at an angle of 62deg from the horizontal with a velocity of 704 ftsec. if it lands 4.75 seconds
superheated steam pressure at a 1 atm mean temperature of 800kand mass flow rate of 0.15kgs enters a thin walled
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The vibrational constant for the (non-degenerate) inversion or "umbrella" motion of NH3 is 950cm-1 . Calculate the percentage of NH3 molecules in a sample at 373 K that will be in the v = 1 state of the inversion mode.
consider a stream power plant that operates on the ideal reheat rankine cycle. the plant maintains the boiler at
This assignment is designed to give you the opportunity to practice using Microsoft Excel to compute a t-test and to reinforce your learning of computing descriptive statistics from a previous module.
If the two antennas are driven with a phase difference of π/2, find the field radiation pattern of the array.
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?
It is assumed that 1/4 of the energy generated from the power source will be used to form the weld nugget. Determine the power-on time the current must be applied in order to perform this spot-welding operation.
a sail plane with a lift-to-drag ratio of 25 flies with a speed of 50 mph. it maintains or increases its altitude by
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