Consider a metal bar of initial length l and cross-sectional area a. the young's modulus of the material of the bar is y. find the "spring constant" k of such a bar for low values of tensile strain. express your answer in terms of y, l, and a.

k = Y*A/L

Step-by-step explanation:

We can apply the Law of Hooke in order to explain the problem.

If we define k = F / ΔL  and the Y = S / δ

Where S is the uniaxial stress: S =  F / A   (i)

and δ is the strain: δ = ΔL / L   (ii)

ΔL is the change in length

we can combine the equations i and ii as follows

Y = (F / A) / (ΔL / L) = (F * L) / (A * ΔL)   (iii)

if k = F / ΔL the equation iii results

Y = k * (L / A)  ⇒   k = Y*(A / L)

answer: 12,000

step-by-step explanation: first you ar e supposed to add. then multiply then subtract