19. gas a is composed of diatomic molecules (two atoms to a molecule) of a pure element. gas b is composed of monoatomic molecules (one atom to a molecule) of another pure element. gas a has three times the mass of an equal volume of gas b at the same temperature and pressure. how do the atomic masses of elements a and b compare?

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.