Apolytropic process is one in which p vn = p1v n 1 = p2v n 2 = constant at all points in the process, where v = v /m is the specific volume of the substance. the exponent n is constant and depends on the nature of the process; for an ideal gas, isothermal process, for example, n = 1. say a substance is compressed from p1 = 100 kpa, v1 = 0.5 m3/kg to p2 = 300 kpa in a polytropic process for which n = 1.4. calculate the work performed during the compression, per unit mass. the integral formula for work per unit mass is obtained by dividing eq. (1) by the system mass, for which dv /m → dv and w1−2/m → w1−2.
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Physics, 22.06.2019 04:30
Erosion of the beach is normally a slow process. however, in certain situations, large chunks of shore may wash out to sea. what could cause this to happen?
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Physics, 22.06.2019 18:50
8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.
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Physics, 22.06.2019 21:20
Abeverage can is made of 3004-h19 aluminum alloy (elastic modulus 69 gpa, tensile yield strength 285 mpa, density 2.72 g/cm^3). the dimensions on the can are approximated as a thin-walled cylinder with a height of 4.83 inches, diameter of 2.60 inches. empty the can has a mass of 14.2 g. determine: a. the wall thickness of the cylinder b. assuming a pinned-pinned condition what is the critical load? c. assuming a fixed-fixed condition what is the critical load?
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Apolytropic process is one in which p vn = p1v n 1 = p2v n 2 = constant at all points in the process...
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