Question

1. a sidewalk was made during a cold fall (it was 5 celsius at the time). the sidewalk was laid down as one long piece of cement from one curb to the other...not like a normal sidewalk with a crack every four feet or so. what problem would occur the following summer when it was very hot out?

a the sidewalk would get a hump in the middle of it
b the sidewalk would break the curb
c the sidewalk would cave in
d the sidewalk would crumble

Explanation:

Cement expands when heated. Since the sidewalk is a single continuous piece laid in cold weather, it has no expansion joints to accommodate the summer heat. The trapped expansion force will cause the sidewalk to buckle upward, forming a hump in the middle.

Answer:

a. The sidewalk would get a hump in the middle of it