A 250. g mass is placed on the spring in #2. Assuming the spring is pointed straight up, to what height could the spring propel the object?

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.

Which is a substance that can be separated by physical means and is not the same throughout

Atoms containing radioactive nuclei are called