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In an experiment, the temperature of a hot gas stream is to be measured by a thermocouple with a spherical junction. Due to the nature of this experiment, the response time of the thermocouple to register 99% of the initial temperature difference must be within 5s. The properties of the thermocouple jinction are k=35 w/m.k, p=8500 kg/m^3, and cp = 320 J/kg.k. If the heat transfer coefficient between the thermocouple junction and the gas is 250 w/m^2.K, determine the diameter of the junction.
air enters a turbojet engine at 180 ms at a rate of 20 kgs and exits at 850 ms relative to the aircraft. what is the
a workpiece is being cut at 76mmin 250 fpm and the power is found to be 2.0 kw 2.7hp. the feed is .25 mmrev .010 inrev
A vibrometer has an undamped natural frequency of 10Hz. and damped natural frequency of 8 Hz. Find the lowest frequency in the range to infinity at which the amplitude can be directly read from the vibrometer with less than 2 percent error.
What is the conductivity of silicon if As dopant is added to achieve a concentration of 1.0x10^23 atoms/m^3? let \mu _n =.14m^2/V-sec and \mu _p = .05m^2/ V-Sec
One part of the gauge section has an initial cross-sectional area that is 0.99 times that of the rest of the gauge section. What will be the true strain in the larger area after the smaller area necks and reduces to 50% of its original area?
the 580-ton tug is towing the 1200-ton coal barge at a steady speed of 6 knots. for a short period of time the stern
air at 140 kpa and 27 degc is contained in the cylinder of a piston-cylinder device. at this initial position the
at steady state work at a rate of 5 kw is done by a paddle wheel on a slurry contained within a closed rigid tank.
sun a 5800 k transfers heat to earth at an average rate of 1360 w per m2 of surface area of earth. the earth has a
Two tanks are connected by a valve. One tank contains 2kg of carbon monoxide gas at 77oC and 0.7 bar. The other tank holds 8 kg of the same gas at 27oC and 1.2 bar. The valve is opened and the gases are allowed to mix while receiving energy by heat t..
Determine the size of the contact patch, the contact stresses, and the maximum shear stress for a 40 mm diameter steel cylinder, 25 cm long, rolled against a flat plate with a 4 kN force pressing the cylinder onto the flat plate.
consider a piston-cylinder assembly containing 0.14 kg of air initially at a pressure of 350 kpa. heat is added during
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