3:Short Questions: a What are Oxxp and Txx in the following equation? (6 marks) xx2+a-=xxo b) What is a constitutive relation? Give an example 4 marks c Give the formula that finds the force acting on a hypothetical surface passing through a point inside a fluid as a function of the stress tensor at that point. 4marks d Explain why the pressure inside waves on the surface of a lake is not exactly equal to the atmospheric pressure.Use surface tension and radii of 5marks curvatures e Explain the physical significance of the diagonal and non-diagonal terms of the strain-rate tensor. (6 marks