5. The strain energy stored in a body, when the load is gradually applied, is (where ? = Stress in the material of the body, V = Volume of the body, and E = Modulus of elasticity of the material)
9. In a riveted joint, when the rivets in.the adjacent rows are staggered in such a way that every rivet is in the middle of the two rivets of the opposite row, the joint is said to be diamond riveted.