Liquid water at 300 kpa and 20°c is heated in a chamber by mixing it with superheated steam at 300 kpa and 300°c. cold water enters the chamber at a rate of 1.8 kg/s. if the mixture leaves the mixing chamber at 60°c, determine the mass flow rate of the superheated steam required.

A12 mm diameter shaft runs in a plain cylindrical bush 30 mm long that is located in an 18 mm diameter hole in a housing. the shaft-inner bush fit is h8 f and the outer bush-housing fit is h7-p6. make a fully cimensioned sketch of the bush with tolerances. find the maximum and minimum clearance or interference for both fits on the inner and outer diameters of the bush