Juan is standing on the street. an ambulance moves toward him and then passes by. what best describes the pitch that juan hears?

What statements accurately describe atoms

The two required components for a generator are

Selma made a diagram to compare convection and radiation. which label belongs in the area marked x? must involve temperature differences between substances or objects only occurs when molecules are in direct contact involves the movement of fluids based on density differences can occur where there is little or no matter