Complete the sentey to describe what a wave is and what it does.
Awave is a
that carries
from one place to another.

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

Asmall 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 n/c. if the ball is in equilibrium when the string makes a 30 ° angle with the vertical, what is the net charge on the ball?