Air at 1.3 bar, 423 k and a velocity of 40 m/s enters a nozzle operating at steady state and expands adiabatically to the exit, where the pressure is 0.85 barand velocity is 307 m/s. for air modeled as an ideal gas with k= 1.4, determine for the nozzle (a) the temperature at the exit, in k, and (b) the isentropic nozzle efficiency.

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present