Question

Energy stored in stretching a string per unit volume is ___________

(a) 1/2×stress×strain

(b) stress×strain

(c) Y(Strain)^2

(d) 1/2 Y(Stress)^2

This question was posed to me in class test.

The query is from Elastic Limit in portion Thermal Properties of Matter of Engineering Physics I

Answer 1

Correct choice is (a) 1/2×stress×strain

To elaborate: Energy stored per unit volume= Work done per unit volume

Energy stored per unit volume = 1/2×Stress×strain.