In the figure, U-section steel purlins are used in the roof beam. Purlins are simply headstock and L = 4m has openness. Purlins are allowed for evenly distributed vertical load q = 1250N / m including dead load they are exposed. Since the slope of the roof is given as tan (α) = 3/4; a) For the section in the middle of the span, calculate the normal stresses for the four corner points. b) What is the angle between the neutral axis and the x axis?

Agas contained within a piston-cylinder assembly e end nation about same energy states, 1 and 2, where pi 10 bar, v undergoes two processes, a and b, between the sam 0.1 m3, ui-400 kj and p2 1 bar, v2 1.0 m2, u2 200 kj: process a: process from 1 to 2 during which the pressure- volume relation is pv constant process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to +20 0 state 2 kinetic and potential energy effects can be ignored. for each of the processes a and b, (a) sketch the process on p-v coordinates, (b) evaluate the work, in kj, and (c) evaluate process the heat transfer, in kj