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Item 4
Which statement best describes the weather shown by the blue triangles going one...
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Item 4
Which statement best describes the weather shown by the blue triangles going one way and the red semicircles going the other way on a line on a weather map?
An occluded front can cause light to heavy precipitation that may last several days.
A stationary front may produce rainy or snowy weather for several days.
A cold front can cause heavy rain, thunder, and lightning.
Answers: 2
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 corneaโs vertex is focused on the retina?
Answers: 1
Physics, 22.06.2019 11:00
The charge on an electron is 1.60218 ร 10โ19 c and its mass is 9.10939 ร 10โ31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.
Answers: 3
Physics, 22.06.2019 15:30
1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?
Answers: 1
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