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Physics, 13.11.2019 09:31 Serenitybella
Question 3
block a is placed on a rough surface inclined at an angle θ above the horizontal. a taut string connects block a over a pulley to block b, which hangs from the string, as shown below. the masses of blocks a and b are ma and mb, respectively. at time t=0, block a is sliding up the slope as block b falls, and the blocks are both slowing down. assume that the mass and friction of the pulley are negligible.
if the mass of block b is 2kg, the gravitational force exerted on block b is most nearly which of the following?
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Physics, 22.06.2019 03:30, zahradawkins2007
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
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Question 3
block a is placed on a rough surface inclined at an angle θ above the horizont...
block a is placed on a rough surface inclined at an angle θ above the horizont...
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