Properties of Matter Part 3

Two slabs with square cross section of different materials (1,2) with equal sides (l) and thickness d1 and d2 such that d2=2d1 and I>d2. Considering lower edges of these slabs are fixed to the floor, we apply equal shearing force on the narrow faces. The angle of deformation is θ2=2θ1. If the shear moduli of material 1 is 4×109N∕m2, then shear moduli of material 2 is x×109N∕m2, where value of x is ____