Physics, 11.03.2020 04:44 BrinkerSky8378
The cable lifting an elevator is wrapped around a 1.0-m-diameter cylinder that is turned by the elevator's motor. The elevator is moving upward at a speed of 1.9 m/s . It then slows to a stop, while the cylinder turns one complete revolution. Part A How long does it take for the elevator to stop
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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 15:50
Decreased sensitivity to an unchanging stimulus is known as
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Physics, 22.06.2019 22:30
When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?
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Physics, 23.06.2019 07:00
Ln finding the density of liquid why is the method of using a density bottle more accurate than the one of using a measuring cylinder
Answers: 1
The cable lifting an elevator is wrapped around a 1.0-m-diameter cylinder that is turned by the elev...
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