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What is the significance of principal stresses in material mechanics?

What is a characteristic of homogeneous materials?

Derive the equilibrium equation in the y direction from a differential element of a material.  Make sure you draw the x, y, and z axes Draw the element and label all of the stresses that act in the y-direction Show all steps

  Problem A:  Consider a plane stress element.  Let the magnitudes of the stresses be σxx = 200 N/m2; σyy = – 100 N/m2; and σxy = 50 N/m2.   Find the maximum shear stress (σxy max) generated in this material and the surface orientation (in terms of an angle) where the maximum shear stress appears.   Find the principal stresses, σ1 and σ2 , and the principal axes   Draw the original diagram with stresses; and then draw a superimposed figure with the principal stresses, the maximum shear stress, and the angle they appear.

What do the general 3-D differential equations of equilibrium include?

Describe the embryological development of the palate (10 marks)

Select the two structures that unite to form the straight sinus

Name the three layers of pericardium, from superficial to deep. Be specific [BLANK-1] [BLANK-2] [BLANK-3]

In the speech process, what is the function of the tongue?  [BLANK-1]

Why did families feel the church cemetery was the most important place to bury the dead?