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The drag characteristics of an airplane are to be determined by model tests in a wind tunnel operated at an absolute pressure of 1300 kPa. If the prototype is to cruise in standard air at 385 km/hr, and the corresponding speed of the model is not to differ by more than 20% from this (so that compressibility effects may be ignored), what range of length scales may be used if Reynolds number similarity is to be maintained? Assume the viscosity of air is unaffected by pressure, and the temperature of air in the tunnel is equal to the temperature of the air in which the airplane will fly
bob is asked to design a system for heating process water in a chemical plant. the system is to heat 500 gallons of
two blocks of rubber with a modulus of rigidity g 5 12 mpa are bonded to rigid supports and to a plate ab. knowing that
A gas mixture exists composed of 45% O2, 35% CO2 and 20% Ar on a molar basis. The pressure of the gas is 1 atm and the temperature is 50°F.
A piston cylinder setup shown below contains 0.1 kg saturated water at 100 kPa with quality 0.25. The mass of the piston is such that a pressure of 500 kPa will float it. The water is heated to 300°C.
a cyndrical tin can with diameter d1 85mm has circular hole drilled in the bottom with diameter d2 6.35 mm. initially
a tank has an inlet flow with a velocity of 200 ftmin through a 4 inch diameter pipe. the fluid is water at standard
Calculate the temperature of the roof in 20?C still air when the sun is overhead (a) if the roofing is of wooden shingles and (b) if it is commercial aluminum sheet.
a steady-flow compressor is used to compress helium from 15 psia and 70of at the inlet to 200 psia and 600of at the
A piston-cylinder device contains steam that undergoes a reversible thermodynamic cycle. Initially the steam is at 400 kPa and 350C with a volume of 0.3 m^3. The steam is first expanded isothermally to 150 kPa, then compressed adiabatically to the in..
A 15cm cube of mass 3kg is lubricated with SAE 10 oil at 20oC (dynamic viscosity of 0.104Ns/m2) slides down a 10o inclined plane at a constant velocity. Estimate the speed of the body if the oil film has a thickness of 2mm and the velocity distrib..
a retarding force is applied to a body moving in a straight line so that during an interval of its motion its speed u
A Brayton gas turbine cycle has two stages of compression and two stages of expansion. The pressure ratio across each stage of the compressor and turbine is 3. The air enters each stage of the compressor at 300K and each stage of the turbine at 1..
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