A solar flare is a sudden, rapid, and intense change in the brightness of the sun. Which of these is most
likely to happen during a solar flare? (1 point)
radio communications may become faster
nuclear power plants may produce lesser
electronic communications may be disrupted
computer navigation systems may show be

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.

Atomic nuclei of almost all elements consist of

Convection currents are caused by differences in what two things?