10-16. The state of strain on an element has components P x = −300(10 −6 ), P y = 100(10 −6 ), gxy = 150(10 −6 ). Determine the equivalent state of strain, which represents (
a) the principal strains, and (
b) the maximum in-plane shear strain and the associated average normal strain. Specify the orientation of the corresponding elements for these states of strain with respect to the original element
 
 
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