bicyclists, starting at the same place, are riding toward the same campground by different routes. One cyclist rides 1170 m due east and then turns due north and travels another 1580 m before reaching the campground. The second cyclist starts out by heading due north for 1880 m and then turns and heads directly toward the campground. (a) At the turning point, how far is the second cyclist from the campgroun

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 is the best predictor of the radioactive nature of an isotope? o the proton-to-electron ratio the neutron-to-proton ratio o the neutron-to-electron ratio the electron-to-proton ratio

What you see with your eyes is a form of energy. a. light b. heat c. chemical d. electrical