Following similar procedures as in Exercise 3.22 , sum the forces and moments on the two-dimensional differential element in polar coordinates (see figure), and explicitly develop the following two-dimensional equilibrium equations:

Data from exercise 3.22

Consider the equilibrium of a two-dimensional differential element in Cartesian coordinates, as shown in the following figure. Explicitly sum the forces and moments and develop the two-dimensional equilibrium equations:

Transcribed Image Text:

r de de de ae + 1 ter tre ar r Tra = + 1 Ter + (ar-ae) r Tre aterde + rde 2tre + -+ Fe = 0 Ter Fe A +Fr=0 dr Ter Fr Trot aor dr or ar atre dr ar