1.7-8 An elastomeric bearing pad consisting of two steel plates bonded to a chloroprene elastomer (an artificial rubber) is subjected to a shear force V during a static load- ing test (see figure). The pad has dimensions a = 125 mm and b 240 mm, and the elastomer has thickness 1-50 mm. When the force equals 12 kN, the top plate is found to have displaced laterally 8.0 mm with respect to the bottom plate. What is the shear modulus of elasticity G of the chloroprene?