During an accident, a heavy vehicle's tyre with inner diameter 0.8m and outer diameter 1.2m is immersed in water with its plane making an angle of 45 degree with the horizontal free surface of water. The center of the inner and outer diameters of tyre is located at 1.625m below the free surface. What will be the total pressure force on the face of the tyre?

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?