Question

A bridge is made from 20 m long iron rods. At temperature 18 °C, the distance between two rods is 0.4 cm. Up to what temperature will the bridge be in good shape?

Answer 1

Answer:

35.4°C

Explanation:

Length of the iron rod = 20 m = 2000 cm

Temperature = 18 °C

Distance between length of the two rods = 0.4 cm

Temperature coefficient of linear expansion of an iron = 11.5 × 10`−6C`−1

Let at temperature be =T when both the rods expand by 0.2 cm ( The total expansion being 0.4 cm )

According to the formula for linear expansion of solids -

Δl/l = a1Δt

= 0.4/2000 = 11.5 × 10`−6 ×(T`−16)

T = 18 + 0.4/2000 × 11.5 × 10`−6

= 35.4°

Therefore, the temperature will the bridge be in good shape upto 35.4°C.

Answer 2

Answer:

REFER TO THE ATTACHMENT

HØPE THIS HELPS YOU❤