Aweightlifter can lift 220lbs. (assume 1kg weighs 2.2lbs) if he lifts the weight 2m above the floor, how much work did he do? follow up: if the weightlifter lifts the weight 1.2 seconds, how much power does he generate?

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.