Question Detail
Question
The steel bed of a suspension bridge is 300 m long at 20°C. If the temperature rises to 45°C, calculate the increase in length. (α = 12 × 10^-6 °C^-1)
Correct Answer
Option B is the correct answer.
Detailed Explanation
ΔL = αLΔT = (12×10^-6)(300)(25) = 0.09 m = 9 cm.
Hint
Use ΔL = αLΔT.