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JAMB Physics 2014 Question 16

Question 16

Elasticity

A force of 500N is applied to a steel wire of cross-sectional area 0.2m2. the tensile stress is

  1. A.1.0 × 102Nm−2
  2. B.1.0 × 103Nm−2
  3. C.2.5 × 103Nm−2
  4. D.2.5 × 104Nm−2
Show the answer and explanation

Answer: C (2.5 × 103Nm−2)

Explanation

Tensile stress = force ÷ area = 500 ÷ 0.2 = 2500 N m−2 = 2.5 × 103 N m−2.