Wind blowing across suspended power lines may

cause the power lines to vibrate at their natural

frequency. This often produces audible sound

waves. This phenomenon, often called an

Aeolian harp, is an example of

(1) diffraction (3) refraction

(2) the Doppler effect (4) resonance

What is a carrier wave and how does it affect what you hear on the radio

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?