two independent wheels start from rest and are given the same angular acceleration. the first wheel turns through (theta) radians before it reaches an angular velocity of (w) How many radians does the second wheel turn through before it reaches an agular speed of 13 (w)?

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.