A vortex is thrown with an initial speed of 20 m/s. The vortex reaches a
maximum height at point Q; 8 m higher than its starting height. What is the value
of the angle that the initial velocity vector makes with the horizontal?

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?