A titanium alloy with a modulus of elasticity of 16 × 106 psi is used to make a 1000-lb part for a manned space vehicle. Determine the weight of a part having the same modulus of elasticity parallel to the fibers, if the part is made of
(a) aluminum reinforced with boron fibers and
(b) polyester reinforced with high-modulus carbon fibers (with a modulus of 650,000 psi).
(c) Compare the specific modulus for all three materials.