Question Detail
Question
The steel bed of a suspension bridge is 300 m long at 20°C. If temperature reaches 45°C, compute the increase in length. α = 12 × 10⁻⁶ /°C.
Correct Answer
Option B is the correct answer.
Detailed Explanation
ΔL = 12×10⁻⁶ × 300 × 25 = 0.09 m = 9 cm.
Hint
Linear expansion formula.