What causes some materials to have magnetic field

A fisherman is watching water waves ripple past his boat. How could he determine the wavelength of the water waves?

Felipe made a toy boat out of clay, but it kept sinking in water. He changed the boat's design by making it slightly wider than before. Why did Felipe's newly designed boat float on water?

Which type of energy is converted when gasoline burns in an engine? A) elastic potential energy B) nuclear potential energy C) chemical potential energy D) gravitational potential energy

Which is the variable that the experimenter changes

Most minerals on earth surface contain which of the following: A:Nitrogen and oxygen B:Oxygen and silicon C:Silicon and nitogen D:Sulfur and hydrogen

According to the Doppler Effect, which statement is true about a sound as it approaches you and then moves away. A) As the source approaches you, the sound waves are compressed so the pitch of the noise increases.

If you have a beam perfectly balanced on a fulcrum and put a weight at the very end of one side, is there a way to know where you should put a heavier object on the other end?

Most of the Earth's volcanoes occuWhen fossils or minerals form, certain unstable elements are sometimes locked into them.

a man is standing on the edge of a 20.0m high cliff. he throws a rock vertically with an initial velocity of 10.0m/s. how high does the rock go?

The slope of a velocity time graph over any interval of time gives the during that interval