A steel cable of radius 0.015 m is used to support a load. If the maximum stress it can withstand is 2 × 108 N/m2, what
Stress: Stress = F / A. Area: A = π r2 = 3.14 × (0.015)2 = 3.14 × 0.000225 = 7.065 × 10-4 m2. Maximum force: F = Stress × A = 2 × 108 × 7.065 × 10-4 = 1.413 × 105 N.
Ref: University Physics, Chapter 17: Thermal Expansion.
