Ahollow circular column of external diameter 200 mm and thickness 5 mm is 6 m long. for the material properties of the column, a column is considered short if the slenderness ratio is less than or equal to 70 a yield stress of 280 mpa to a proportional limit of 210 mpa may be used. find the load capacity of the column.

For each of the following process: a) sketch the p-v diagram, b)sketch t-s diagram, c) sketch t-v diagram, d) sketch the boundary work on one of the diagrams (a, b or c) and e) sketch the reversible heat transfer on one of the diagrams (a, b or c): 1- isobaric process from compressed liquid to superheated vapor 2- isothermal process from compressed liquid to superheated vapor 3- isentropic process from compressed liquid to superheated vapor