The source of all magnetic fields is

-magnets

-electric currents

How do chemical changes affect our everyday life?

How can you tell the number of protons and nuetrons in nucleus

What is the uses of echoes?

The packets of energy that light travels in are called

How does the voltage across a resistor compare the voltage across an inductor vl vr?

Kai was 200 meters north of the library when he remembered he had to return some books to the library. It took him 200 seconds to do the round trip. Which best describes Kai's roundtrip?

The engine that powers a crane burns fuel at a temperature of 1500 oC. It is cooled by air at a temperature of 20 oC. The crane is used to lift a 1000 kg steel girder 30 m into the air.

The portion of a light ray that falls on a surface is a/an

Give the definition for diffusion. (A) gas molecules mix unequally average distance between collisions (B) gas molecules escape from a container into a vacuum through a small hole (C) gas molecules mix equally (D) gas molecules spread out in a

As resistance goes up, what happens to the current?