1. The problem statement, all variables and given/known dataDerive the differential equation governing the longitudinal vibration of a thin cone which has uniform density p, show that it is 1/x/SUP] d/dx(x du/dx) = (1/c) d u/dt Hint: The tensile force sigma = E du/dx where E is the Young's modulus (a constant), u is the longitudinal displacement and x is the longitudinal coordinate. 2. Relevant equations 3. The attempt at a solution I wasn't sure where to start so if someone give help me understand how to start this problem I would appreciate it.