Weight rather than mass must be used when calculating:
Correct answer: C. The stress in a wire due to a load hanging from it
- A. The gravitational force between two bodies
- B. Specific heat capacity of a body
- C. The stress in a wire due to a load hanging from it
- D. The moment of inertia of a body
Explanation
When calculating the stress in a wire, weight is used instead of mass because stress is a force per unit area, and weight is a force. Stress is defined as the force ( F ) applied to a material divided by the cross-sectional area ( A ) over which the force is applied. In the case of a load hanging from a wire, the force ( F ) is the weight of the object, which is given by W = mg , where ( m ) is the mass of the object and ( g ) is the acceleration due to gravity. Using weight in stress calculations is appropriate because stress is a measure of the internal forces within a material, and the force acting on the material is the weight of the hanging load. This approach is common in engineering and materials science, where understanding the impact of external forces on materials is crucial.
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