Answers: 1
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 12:30
Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=
Answers: 2
Physics, 23.06.2019 00:10
An astronaut floating in space is trying to use her jetpack to get back to her space station, but she is being pulled away by a nearby planet, as shown in the image below. her jetpack provides a constant thrust of 310 n. if she angles her jetpack in such a way that it cancels out the vertical force due to the planet's gravity, what is her net horizontal force? thaud 487 o a. 54.8 n toward the space station o b. 212.9 n toward the space station o c. 185.2 n toward the space station o d 956 n toward the space station
Answers: 1
Two point charges lie on the x axis. a charge of 6.4 μc is at the origin, and a charge of -9.5 μc is...
Mathematics, 31.12.2020 15:50
English, 31.12.2020 15:50
Mathematics, 31.12.2020 16:00
Physics, 31.12.2020 16:00
English, 31.12.2020 16:00
Mathematics, 31.12.2020 16:00
Mathematics, 31.12.2020 16:00
Mathematics, 31.12.2020 16:00
Computers and Technology, 31.12.2020 16:00
English, 31.12.2020 16:00
Physics, 31.12.2020 16:00
World Languages, 31.12.2020 16:00
Social Studies, 31.12.2020 16:00
Mathematics, 31.12.2020 16:00