4. Sketch the following directions and planes within a cubic unit cell: (a) [221] (b) [012] (c) (030) (d) (041) 8. A single crystal of an FCC metal is oriented such that the [001] direction is parallel to an applied stress of 5000 psi. Calculate the resolved shear stress acting on the (111) slip plane in the [110],[011], and [101] slip directions. Related, which slip system(s) will become active first? Note that the angle between the [001] direction and the normal to the (111) plane is =54.76