Suppose that a steel bridge, 1000 m long, was built without any ...

[tuffie]

Suppose that a steel bridge, 1000 m long, was built without any expansion joints and that only one end of the bridge was held fixed.
 
  What would the difference in the length of the bridge be between winter and summer, taking a typical winter temperature as 0.00C, and a typical summer temperature as 40C? The coefficient of thermal expansion of steel is 10.5  10-6 K-1.
  A) 0.42 m
  B) 0.11 mm
  C) 0.11 m
  D) 0.42 mm
  E) 0.37 cm

Question 2

Two identical concrete slabs lie flat and in contact with each other as shown in the figure.
 
  If the temperature increases by 40C, the lower edges opposite the contact edges remained fixed in position, and the lower edges of the contact side remain in contact, at what angle will the slabs be tilted? The coefficient of thermal expansion of the concrete is 10  10-6/K.
 
  A) 19
  B) 0.028
  C) 15
  D) 1.6
  E) The answer depends on the length of the slabs.

[beccamahon]

Answer to Question 1

Answer: A

Answer to Question 2

Answer: D

[tuffie]

TYSM

[nathang24]

Gracias!