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As a means of preventing ice formation on the wings of a small, private aircraft, it is proposed that electric resistance heating elements be installed within the wings. To determine representative power requirements, consider nominal flight conditions for which the plane moves at 100 m/s in air that is at a temperature of -23°C. If the characteristic length of the airfoil is L = 2 m and wind tunnel measurements indicate an average friction coefficient of Cf = 0.0025 for the nominal conditions, what is the average heat flux needed to maintain a surface temperature of Ts = 5°C?
A company is trying to decide which machine to purchase based on the following information. If they all have 15 years useful life and MARR is 10%, use incremental rate of return analysis in Excel to decide which one is the best choice. Don't forge..
If the minimum attractive rate of return is20% per year, determine the one machine that should be selected on the basis of a rate of return analysis.
Other observations by the Cassini probe have confirmed that Titan has a thick atmosphere of nitrogen and methane with a density of about 10 times that of the Earth's atmosphere. Is this finding completely consistent with Titan's position on the atmos..
A structure is fixed to a surface at point O and supports 300 and 400 N couples as shown. Determine the resultant couple moment vector, using both scalar and vector approaches (solve twice).
a 12-kg solid whose specific heat is 2.8 kjkg degree c is at a uniform temperature of -10 degree c. for an environment
a compressor used to deliver 2.10 kgmin of high pressure air requires 8.087 kw to operate. at the compressor inlet the
One kilogram of nitrogen gas (N2) is undergoes an isothermal compression from 1 bar, 20C to a final pressure of 12 bar. During the process, the nitrogen transfers heat through a wall to a thermal reservoir with a temperature of 10C.
propane gas enters a continuous adiabatic heat exchanger at 40degc and 250 kpa and exits at 240degc superheated steam
a certain industrial process requires a steady stream of saturated vapor steam at 200 kpa at the rate of 2 kgs. there
A piston cylinder device contains about 0.25kg of saturated water liquid @ 125C. Now water is heated at constant pressure until it becomes saturated vapor. How much is the work done during this process? How much is the heat transfer into the system?
(a) derive an expression for the net work transfer for the cycle. Prove that for a Stirling Cycle, the net work transfer is always from the system to the surroundings.
water at a flow of m .215 kgs is cooled from 82 degrees c to 42 degrees c by passing it though a thin-walled tube of
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