Atransmission channel is made up of three sections. the first section introduces a loss of 16db, the second an amplification (or gain) of 20db and the third a loss of 10db. assuming a transmitted power level of 400 mw, determine the mean output level of the channel.

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.