The bridges often have expansion joints to account for the changes in size due to temperature changes. suppose a bridge is supported by steel girders; the central span has a girder that is 32 m long. if the girder warms from 0∘c to 32 ∘c, by how much does its length increase?

1.33 cm

Explanation:

L = 32 m, T 1 = 0 degree C , T2 = 32 degree C

Thermal expansion coefficient of steel, α = 13 x 106-6 per degree C

Let ΔL be the increase in length.

ΔL = L x α x ΔT

ΔL = 32 x 13 x 10^-6 (32 - 0)

ΔL = 0.0133 m = 1.33 cm

answer and explanation;

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)