A cylindrical eraser of negligible mass is dragged across a paper at a constant velocity to the right by its pencil. The coefficient of kinetic friction between eraser and paper is 0.650. The pencil pushes down with 3.70 . The height of the eraser is 1.05 and its diameter is 0.730 . Its top surface is displaced horizontally 0.920 relative to the bottom. Determine the shear modulus of the eraser material.