The neighborhood children are playing and one has lost a pocketful of change. As a result they all decide to do a close inspection of the sidewalk. They notice that there are gaps in between the sidewalk filled with a felt - like material. These gaps will prevent
A) high stress due to electron "collisions"
B) high stress due to thermal expansion.
C) high stress due to brittleness
D) high stress due to the weight of the sidewalk

Question

Quizplus · Accepted Answer

The felt-like material in the gaps between sidewalk sections is used to accommodate thermal expansion. As the temperature changes, the concrete can expand or contract without causing cracks or damage, thus preventing high stress due to thermal expansion.

The Neighborhood Children Are Playing and One Has Lost a Pocketful