What is a main difference between Mars and Saturn? 1. Mars has a relatively longer distance from the sun and many more moons than Saturn.
2. Mars has a relatively shorter year and a higher atmospheric temperature than Saturn.
3. Saturn has many more rings and a relatively higher atmospheric temperature than Mars.
4. Saturn has many more rings and a relatively shorter year than Mars.

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.