Engineering, 05.11.2019 02:31 kendrabrown41
Anew composite material is being developed for an advanced aerospace structure. the material's density is to be determined from the mass of a cylindrical specimen. the volume of the specimen is determined from diameter and length measurements. it is estimated that the mass, m, can be determined to be within 0.1 lbm using an available balance scale; length, l, to within 0.05 in. and diameter, d, to within 0.0005 in. (a) estimate the design stage uncertainty in the determination of the density. (b) which parameter’s measurement would contribute most to the uncertainty in the density? use nominal values of m = 4.5 lbm, l = 6 in., and d = 4 in. hint: for cylindrical component, the volume v = πd^2l/4 , therefore the density rho = m/v = 4m/ πd^3l . úse the error propagation rule to determine the design stage uncertainty.
Answers: 1
Engineering, 03.07.2019 15:10
Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?
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Engineering, 04.07.2019 18:10
Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.
Answers: 1
Engineering, 04.07.2019 18:10
Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.
Answers: 3
Engineering, 04.07.2019 18:10
You are making beer. the first step is filling the glass carboy with the liquid wort. the internal diameter of the carboy is 15 in., and you wish to fill it up to a depth of 2 ft. if your wort is drawn from the kettle using a siphon process that flows at 3 gpm, how long will it take to fill?
Answers: 1
Anew composite material is being developed for an advanced aerospace structure. the material's densi...
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