Question

the speed of a longitudinal mechanical wave in a material is 4200m/s youngs modulus of the material is 15x10^9 what is the density of the material

Answer 1

Young's Modulus = Y = stress/strain = σ / ε

Energy per unit volume =  U = 1/2 * stress * strain²

 U = 1/2 * σ * ε²

USE ABOVE FORMULAS AND PLZZ TRY CALCULATING IT.

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