11.What type of wave requires a medium through which to travel? a. Mechanical waves
b. Microwaves
C. X-rays
d. Gamma rays

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

Arowboat passenger uses an oar to push the boat off the dock by exerting a force of 40n for 3.0s. what impulse acts on the boat.

If element x has 99 protons how many electrons does it have