A traction distribution t acts on a plane surface A . The value of t at a given point on A is t = 3000 i 2000 j + 4000k (psi). The unit vector e = i + j + k is perpendicular to A and points away from...

A traction distribution
t
acts on a plane surface
A. The value of
t
at a given point on
A
is
t
= 3000i
2000j
+ 4000k (psi). The unit vector
e
=

i
+

j
+

k
is perpendicular to
A
and points away from the material. What is the normal stress σ at the given point?