Clara made a chart to summarize some of the evidence that supports the big bang theory. which best describes clara’s error? during redshift, the light source and observer move closer together, not farther apart. the cmb is blue-shifted, not red-shifted, to the microwave region. the temperature of the cmb is cooler, not hotter, than at the time of the big bang. the redshift indicates approaching, not receding, galaxies.

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.

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

How do the kidneys affect homeostasis