Amelia Earhart was an aviation pioneer. During an attempt to make a circumnavigational flight of the globe in 1937 her plane disappeared over the ocean. If her plane had hit a rock in the ocean they both would sink together. 1) Elastic
2) Inelastic
3) Explosion

Difference between series and parallel circuits

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.

Are formed where bumps from two surfaces come into contact ?