Q8. Figure 4 is a simplified diagram to show radio waves from a transmitter

moving upwards, then meeting boundary between lower and upper layers of

the atmosphere

upper layer

lower layer

Q

radio transmitter

Figure 4

Explain what happens to the radio waves after they meet the boundary between

the lower and upper layers as shown in Figure 4.

Your explanation should refer to changes in direction and speed of the waves

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.