Evaporation of a freely falling drop a drop of water, 1.00 mm in diameter, is falling freely through dry, still air at pressure of 1atm and a temperature of 100°F with no internal circulation. Assume quasi-steady-state behavior and a small mass-transfer rate to compute 

(a) The velocity of the falling drop, 

(b) The surface temperature of the drop,

(c) The rate of change of the drop diameter in cm/s. Assume that the film properties are those of dry air at 80°F.