Question

When a force is applied to a spring, it gets
extended by an amount x as shown.
(a) Name the law relating stress and strain.
(b) Calculate the stress developed in a metal
wire when it is strained by 30%. Given
young’s modulus of material is 200 GPa.

Answer 1

Answer:

I think the answer is (b) hope this will help you

Answer 2

(a) Hooke's law

(b)

$stress = y \times strain \\ stress = 200 \times {10}^{9} \times 0.3 = 6 \times {10}^{10}$