Final answer:
To determine the internal normal force, internal shear force, and internal moment at point D and point E for member BC, we need to analyze the forces and moments acting on the member.
Step-by-step explanation:
To determine the internal normal force, internal shear force, and internal moment at point D and at point E for member BC, we need to analyze the forces and moments acting on the member. The internal normal force at a point in a member is the force exerted perpendicular to the cross-sectional area of the member at that point. The internal shear force is the force that acts parallel to the cross-sectional area of the member and is caused by forces applied to the member. The internal moment is the rotational effect on the member caused by internal forces.
In the context of this question, we would need more information, such as the specific forces and moments applied to member BC, to determine the values of the internal normal force, internal shear force, and internal moment at points D and E.