Final answer:
The stress tensor components provided in the question cannot be used to determine the components of P on the boundary plane without information about the boundary orientation.
Step-by-step explanation:
The stress tensor components are given as sigma = [7 15 5 15 4 -3 5 -3 0] MPa. To find the components of P on the boundary plane, we need to identify the boundary orientation. Unfortunately, the question does not provide any information about the boundary orientation. Without this information, we cannot determine the components of P on the boundary plane.