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Young's modulus: Y = (Stress) / (Strain). Strain: Strain = ΔL / L = (0.5 × 10-3) / 5 = 1 × 10-4. Stress: Stress = Y × Strain = 2 × 1011 × 1 × 10-4 = 2 × 107 N/m2.
Ref: University Physics, Chapter 17: Thermal Expansion.
Young's modulus: Y = (F L) / (A ΔL). Rearrange: F = (Y A ΔL) / L. Substitute: ΔL = 0.3 × 10-3 m, so F = (2 × 1011 × 4 × 10-6 × 0.3 × 10-3) / 3 = 80 N.
Ref: University Physics, Chapter 17: Thermal Expansion.
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