An elevator weighs w and it is supported by a D diameter cable, L long.  When the elevator carries a W load, the cable elongates ?L more.  What is the modulus of elasticity, E , of the cable?  Given: w = 15 kN, D = 20 mm, L = 175 m, W = 6.6 kN, and ?L = 25 mm An elevator weighs w and it is supported by a D diameter cable, L long. When the elevator carries a W load, the cable elongates ?L more. What is the modulus of elasticity, E, of the cable? Given: w = 15 kN, D = 20 mm, L = 175 m, W = 6.6 kN, and ?L = 25 mm Solution F = W+w A = pi*D^2/4 Y = FL/(A*deltaL) substitute to get answer .