During air cooling of steel balls, the convection heat transfer coefficient is determined experimentally as a function of air velocity to be h=17.9V0.54 for 0.5
Determine the temperature gradient in the steel ball at the surface. (Round the final answer to the nearest whole number.)

Asteam is contained in a rigid tank with a volume of 1 m3. initially, the pressure and temperature are 7 bar and 500 oc, respectively. the temperature drops due to cooling process. determine: (1) the temperature at which condensation begins in °c, (2) the fraction of the total mass that has condensed when the pressure decreased to 0.5 bar. (3) the volume in m3 occupied by saturated liquid at the final state?