Which statement best describes the importance of joints in the roadways of Bridges ? a. Joints strengthen the roadway to support cars and trucks

b. Joints allow the roadway to expand and

contract with varying outside temperatures

c. Joints allow the roadway to expand and contract as cars put force on the bridge

d. Joints allow the bridge to be built in smaller, easier to assemble pieces.

Which of the following is a homogenous mixture? o a. a toy box filled with toys o b. blood o c. trail mix o d. spaghetti and meatballs submit

Very large accelerations can injure the body, especially if they last for a considerable length of time. one model used to gauge the likelihood of injury is the severity index ( ), defined as =/ . in the expression, is the duration of the accleration, but is not equal to the acceleration. rather, is a dimensionless constant that = the number of multiples of that the acceleration is equal to.in one set of studies of rear-end collisions, a person's velocity increases by 13.7 km/h with an acceleration of 36.0 m/s2 . let the + direction point in the direction the car is traveling. what is the severity index for the collision?

Suppose you increase your walking speed from 7 m/s to 13 m/s in a period of 2 s. what is your acceleration?