alleryOn a metal's stress-strain graph, the straight part from O to A is where:
AThe metal breaks
BThe metal melts
CStrain is zero
DHooke's law holds
Answer & Solution
Correct answer: D. Hooke's law holds
1. A straight line means stress is proportional to strain.
2. That is exactly Hooke's law.
3. So Hooke's law holds from O to A.
_Source: syllabus Physics Part II, Chapter 9, Mechanical Properties of Solids._
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