Explain why open pipes are preferred to closed pipe in the production of music-

What is the single most important equation in all of physics?

What happens to the vapor pressure of a substance when its surface area is increased at constant temperature?

The field lines around one end of a bar magnet are shown below based on the diagram, what can you conclude about the pole of the magnet? a. is a south pole because the field hnes spread out from this end b. a north pole because the field lines spread out from this end c. a nouth pole because the field lines enter the magnet at this end d. is a north pole because the field lines enter the magnet at this end