John is running down the street and hears dogs barking in the distance. how do the sound waves change as john approaches the barking dogs
a the height of the sound waves decreases
the height of the sound waves increases
the pitch of the sound waves changes from high to low.
ud
the pitch of the sound waves changes from low to high

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?

Newtons view of arrangement of the universe. don't copy from anywhere.

What is the difference between mass density and weight density?