A weightlifter must exert 25 Newtons of force to lift a set of barbells 2 meters off the ground.
How much work did he do on the barbells when he lifted
them?

A. 50 Nm
B. 2.5 Nm
C. 0 Nm

What properties of a moving object are used in determining the object's energy of motion

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.

You can estimate the degree to which a bond between two atoms is ionic or covalent by calculating the