In waves, the motion of the particles in a medium is along the direction of the wave (parallel). *

The air that we breath is made mostly of which gaseous molecule

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

Observations show that interstellar clouds can have almost any shape and