What is the brewster angl

Although longitudinal waves can travel through all media types what is the disadvantage of this type of wave transmission? a) he efficiency of he wave transmission is greatly diminished as the media becomes less dense b) the oscillation of one set of particles has a huge impact on neighboring particles c) particles become too close together as they bump into each other making it more likely to hit other particles down the line

Heterogeneous mixture with larger particles that never settle is

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block