A rectangular block of a material with a modulus of rigidity G=90 ksi is bonded to two rigid horizontal plates. The lower plate is fixed, while the upper plate is subjected to a horizontal force P. Knowing that the upper plate moves through 0.04 in. under the action of the force, determine the force P exerted on the upper plate. ( I need all the step) thank you !

 

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2 in. 2.5 in. 8 in.. 2 in. 2.5 in. 8 in..