If you were to yell at a canyon wall, you would hear yourself a short time later. this is because sound can be
a. reflected.
b. refracted.
c. diffracted.
d. polarized.

Friction removes energy from objects in motion. which statement best describes how this works? a) friction transforms ke into thermal energy b) friction transfers thermal energy to ke c) friction transforms te into pe d) friction transforms pe into ke e) friction transfers ke into pe