Physics, 19.07.2019 16:10 cathydaves
Atuning fork with a frequency of f = 536 hz is placed near the top of the tube shown below. the water level is lowered so that the length l slowly increases from an initial value of 20.0 cm. determine the next two values of l that correspond to resonant modes. (assume that the speed of sound in air is 343 m/s.)
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Natural forces that can alter ecosystems include seasons and climate changes. t or f
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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 07:00
Within a pendulum, as potential energy decreases, energy increases. a. heat b. kinetic c. frictional d. gravitational
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Atuning fork with a frequency of f = 536 hz is placed near the top of the tube shown below. the wate...
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