How is energy produced during nuclear fission?
o
a. particles change from one type of nucleon into another type of
nucleon, and energy is released.
o
b. small nuclei merge and from a large nucleus, and some mass is
converted into energy.
o
c. a nucleus in an excited state moves into a state of lower energy,
releasing energy in the process.
o
d. a large nucleus splits apart into two or more small nuclei, and
mass is converted into energy.

Air flows upward in the wick of a lantern because of the liquid property called

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.

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