Author Question: Suppose that a steel bridge, 1000 m long, were built without any expansion joints. Suppose that only ... (Read 89 times)

oliviahorn72 · **on:** Jul 29, 2018

Suppose that a steel bridge, 1000 m long, were built without any expansion joints. Suppose 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 0C, and a typical summer temperature as 40C? The coefficient of thermal expansion of steel is 10.5 10-6K-1.
A)

0.42 m

B)

0.11 mm

C)

0.11 m

D)

0.42 mm

E)

0.37 cm

Question 2

A convex lens has focal length f. If an object is located extremely far from the lens (at infinity), the image formed is located what distance from the lens?

A) 2f
B) f
C) between the lens and f
D) infinity
E) between f and 2f