1. The problem statement, all variables and given/known data A nano-tube having cross sectional area A and length L extends ΔL when a force F is applied normally to one of the cross-sectional surfaces. Show that if N tubes are connected end-to-end the then Young's modulus of the fibre does not change. 2. Relevant equations 3. The attempt at a solution Not sure how to answer this but: Stress on the nano-tubes regardless of how much there are will not change. So force and cross sectional area would be a constant. I'm assuming that the total length of lets say a wire, will extend proportional to its length. So the Strain will remain constant. So the Young's modulus of the nano-tube will not change.