Answer:
6
Explanation:\
tbh I dont really know I just looked it up and it said six
Water bottle and a paper towel role
Waves in which the displacement of the medium is in the same directions as, or the opposite direction to, the traveling wave's direction.
A wave in which the particle movement is parallel to the wave's direction.
I gave to definition, I hope you understand it. Have a nice day :)
If the friction increase it would make the thing sliding down slower and makes heat
It’s red shift and blue shift because This only occurs when the frequency of the wave is made longer or shorter due to the movement of the source relative to the observer
