Radio waves are what cell phone company rely on
I don’t know what your talking about. ?!?!?!?
The correct answer for the question that is being presented above is this one: "(d) the hollow bix." The large, flat piece of wood within a piano serves the same purpose as <span>(d) the hollow bix. The piece of flat wood will help piano produce a good quality sound.</span>
Assuming this is an elastic collision, they go in the direction of the object with more mass
