Answers

  • Brainly User
2015-01-10T18:11:42+05:30
The energy is strain energy and given by (0.5*stress*strain)

E = 0.5*stress*strain 
   = 0.5*stress*(stress/y)
   =(stress)²/2y

stress = force/area
force = 5kg weight = 5*9.8N = 49 N
area = 1 cm² = 10^-4 m²
stress = 49/10^-4 = 4.9*10^5 N/m² = 4.9*10^5 Pa
y = 10^11 Pa

E = (4.9*10^5)²/2*10^11 J
   = 2.4*10^11 / 2*10^11 J
   = 1.2 J

Energy stored is 1.2 J.
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