PHYSICS
JAMB 2004 - Question 38
Physics 2004 JAMB Past Questions - Question 38: Metal rods of length 20m each are laid end to end to form a bridge at 25°C. What gap will be provided between consecutive rails for the bridge to withstand 75°C?
Choose the correct answers from the options given.
A:
B:
C:
D:
Correct Answer
C
Explanation
Safety gap = expansion of the rod
= α×L0×Δt
where α = linear expansivity of the material
L0 = Initial length of the material
Δt = Change in temperature
∴ The safety gap = 2×10^−5×20×(75−25)
= 2×10−5×10^3
= 2×10^−2m
= 0.02 m
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