Which statement best describes why the bridge buckles when there isn't a joint ? a. Temperature causes expansion and contraction of the roadway, which is limited without a joint

b. The metal in the joint is not affected by temperature, so without it bridges buckle

c. The material of the roadway doesn't expand under temperature

d. Joints increase the strength of the roadway to prevent the weight of cars and trucks from causing the bridge to buckle

Consider the following problem: a box with an open top is to be constructed from a square piece of cardboard, 3 ft wide, by cutting out a square from each of the four corners and bending up the sides. find the largest volume that such a box can have.

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?