Ashaft rotating at 2,500 rpm is transmitting a power of 15 hp. (a) if the diameter of the shaft is 1.5 in, determine the maximum shear stress. (b) if the circular shaft is to be replaced with a square shaft, what would be the size to that the maximum shear stress remains the same?

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?