When synthetic materials are made from natural materials, the atoms that make up the original substances are regrouped into new molecules. *
True
False

What is the measure of a change in an objects velocity?

Most short-period comets do not have randomly oriented orbits because

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.