a runner moves 2.88 m/s north. she accelerates at 0.350 m/s2 at -52.0 angle. at the point where she is running directly east, what is Δy?

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

Idon't understand is there supposed to be a list or something if there is pm or add in under this message i will do my best to .

Special care would be an answer

Sounds propagates through some kind of medium. usually it's air, but it goes just as well through solid objects like walls, windows etc. a soundwave will compress the (air)molecules in front of it, and if this increased density wave hits your ears, you register it as sound. solid objects like walls are a lot denser than air, this means that they will damp a wave, but also carry it easier.