If you push on a cart on a railroad with a force of 500 N and it doesn't move, you can conclude that a. the cart has too much mass to accelerate
b. the force is canceled by the reaction force.
c. there is a force of 500 N in the opposite direction acting on the cart.
d. the normal force is greater than 500 N.
e. Newton's second law is not valid in such a frame of reference.

Although longitudinal waves can travel through all media types what is the disadvantage of this type of wave transmission? a) he efficiency of he wave transmission is greatly diminished as the media becomes less dense b) the oscillation of one set of particles has a huge impact on neighboring particles c) particles become too close together as they bump into each other making it more likely to hit other particles down the line