Physics, 04.09.2019 17:20 julialombardo53
Given the thermochemical equations x2+3y2⟶2xy3δh1=−370 kj x2+2z2⟶2xz2δh2=−120 kj 2y2+z2⟶2y2zδh3=−270 kj calculate the change in enthalpy for the reaction. 4xy3+7z2⟶6y2z+4xz2
Answers: 1
Physics, 21.06.2019 19:30
11. you want to calculate the displacement of an object thrown over a bridge. using -10 m/s2 for acceleration due to gravity, what would be the total displacement of the object if it took 8 seconds before hitting the water?
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Physics, 22.06.2019 03:30
As part of an industrial process, air as an ideal gas at 10 bar, 400k expands at steady state through a valve to a pressure of 4 bar. the mass flow rate of air is 0.5 kg/s. the air then passes through a heat exchanger where it is cooled to a temperature of 295k with negligible change in pressure. the valve can be modeled as a throttling process, and kinetic and potential energy effects can be neglected. (a) for a control volume enclosing the valve and heat exchanger and enough of the local surroundings that the heat transfer occurs at the ambient temperature of 295 k, determine the rate of entropy production, in kw/k. (b) if the expansion valve were replaced by an adiabatic turbine operating isentropically, what would be the entropy production? compare the results of parts (a) and (b) and discuss.
Answers: 3
Physics, 22.06.2019 10:10
In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?
Answers: 1
Physics, 22.06.2019 16:00
At what time will the interfering waves have an amplitudeof zero?
Answers: 1
Given the thermochemical equations x2+3y2⟶2xy3δh1=−370 kj x2+2z2⟶2xz2δh2=−120 kj 2y2+z2⟶2y2zδh3=−270...
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