Graphing position vs. time someone me i don’t know how to get the average and it’s also asking me to
a) make a graph than use the graph to find two instantaneous velocities
b) two average velocities
c) obvious locations of changing velocity

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?

What are similarities and differences between refraction, reflection, diffraction and absorption?

It is really hard for me right know