An fcc crystal is pulled in tension along the [100] direction. (a) knowing that slip systems will include planes in {111} and directions in < 110> , show how you confirmed which combinations of planes and directions can be slip systems (b) determine the schmid factor for all slip systems. (c) identify the slip system(s) that will be activated first. (d) what is the tensile stress at which this crystal will flow plastically? (τcrss = 50 mpa.)