Post-UTME Physics 2016 Objective — Question 5
Question 5 of 20 from the Post-UTME Screening (Post-UTME) Physics 2016 Objective paper, with the correct answer and a full explanation.
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A 9m steel bar is heated through 20C. What is the change in its length? [alpha steel = 1.2 x 10-5K-1]
- A. 0.22mm
- B. 0.02mm
- C. 21.60mm
- D. 2.16mmCorrect
Explanation
Change in length = L x alpha x deltaT = 9 x 1.2x10^-5 x 20 = 2.16x10^-3 m = 2.16mm.
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