Question

vi)
In olden days, while laying the rails for
trains, small gaps used to be left between
the rail sections to allow for thermal
expansion. Suppose the rails are laid at
room temperature 27 °C. If maximum
temperature in the region iş 45°C and
the length of each rail section is 10 m,
what should be the gap left given that a
= 1.2 x 10-K for the material of the rail
section?
​

Answer 1

Answer:

The gap that should be left between rail sections is 2.16 mm.

Explanation:

Hope it helps you

Answer 2

Answer:

T1 = 27°C

T2 = 45°C

L. = 10m

a = 1.2×10-⁵K-¹

L2 - L1 = L × a × ( T2 – T1 )

10 × 1.2 × 10-⁵ × (45–27)

10 × 1.2 × 18 × 10-⁵

2.16mm