Wood is a composite material that consists of long stiff fibres of cellulose aligned in a softer lignin matrix (organic polymer). The ratio of the elastic modulus of wood in the longitudinal direction (along the grain) to that in the transverse direction (perpendicular to the grain) is 10 . If the volume fraction of cellulose is Vc=0.6, estimate the ratio of the elastic moduli Ec/El of the cellulose to that of the lignin