Which statement best describes how the temperature of the ocean's surface water varies? a. areas with a low salinity have the coldest water b. areas close to the poles have the warmest water c. areas at high altitude have the coldest water d. areas with high density have the warmest water

Which of the following represents an upside-down image?

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.

Which of the following is not an appropriate unit for acceleration? (kg/12 mihr? m/min/sec cm/30c?