Richard and Brooke's teacher tells them to place 30 marbles in an 8-inch baking pan to make a model. She tells them that each marble represents a water molecule in the liquid state. Then she asks them to move their model to show what happens to the liquid water molecules when heat is added. What do Richard and Brooke do to show this?

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.

What are similarities and differences between refraction, reflection, diffraction and absorption?

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island