Question

b. 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:

Length of the iron rod =20m=2000cm at 18 C°

Distance between the length of two rods, =0.4cm Temperature coefficient of linear expansion of iron =11.5×10  ^−6  C  ^−1

 The bridge will be in good shape until both the rods expand by 0.2 cm as the temperature is increased. Let at temperature T, both the rods expand by 0.2 cm i.e. the total expansion is 0.4 cm.

Using the formula for the linear expansion of solids, we have

Δ1/1  =a ΔT

∴ 0.4 /2000  =11.5×10  ^−6  ×(T−18)

T=18+ 0.4/ 2000×11.5×10  ^−6  =35.4 C°

PLZ MARK AS BRIANLIEST AND THX FOR THE SUPERB QUESTION

Answer 2

Answer:

REFER TO THE ATTACHMENT

HØPE THIS HELPS YOU❤