Acosmic ray electron moves at 6.5x 10^6 m/s perpendicular to the earth's magnetic field at an altitude where the field strength is 10x 10^-5 t. what is the radius, in meters, of the circular path the electron follows?

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.