A rectangular plate in plane stress is subjected to normal stresses ?x and ?y and shear stress ?xy. Stress ?x is known to be 15 MPa, but ?y and ?xy are unknown. However, the normal stress is known to be 33 MPa at counterclockwise angles of 358 and 758 from the x axis. Based on this, the normal stress ?y on the element in the figure is approximately:
(A) 14 MPa
(B) 21 MPa
(C) 26 MPa
(D) 43 MPa
(C) 26 MPa
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