[1] The solid below is subjected to the following stress state in equilibrium I cm 1 cm [xy 5y] [5y 4x] (in MPa) Determine: (a) The expression of the forces per unit of mass acting on the solid. (b) The expression of the normal and tangent components of the forces acting on the boundary, indicating their sign according to the Mohr's circle criterion.

[1] The solid below is subjected to the following stress state in equilibrium I cm 1 cm [xy 5y] [5y 4x] (in MPa) Determine: (a) The expression of the forces per unit of mass acting on the solid. (b) The expression of the normal and tangent components of the forces acting on the boundary, indicating their sign according to the Mohr's circle criterion.