Post-UTME Physics 2015 Objective — Question 7
Question 7 of 20 from the Post-UTME Screening (Post-UTME) Physics 2015 Objective paper, with the correct answer and a full explanation.
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The maximum strain which a steel wire can withstand is 3 x 10-6. Calculate the stress on the wire. [Young's modulus for steel = 1.8 x 10^11Nm-2]
- A. 2.7 x 10^5Nm-2
- B. 8.3 x 10^-18Nm-2
- C. 5.4 x 10^5Nm-2Correct
- D. 1.7 x 10^-17Nm-2
Explanation
Stress = strain x Young's modulus = 3x10^-6 x 1.8x10^11 = 5.4x10^5 Nm-2.
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