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

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?

Aparticle moves in a circle 1.50 m in radius . through what angle in radians does it rotate if it moves through an arc length of 2.50m? what is the angle in degrees?

What structural formula represents 4 electrons shared between two atoms?