A windmill for generating electricity has a blade that is 30 feet long. Depending on the wind, it rotates at various velocities. Find the angular velocity in rad/sec for the tip of the blade if the windmill is rotating at a rate of 55 comma 145 rev/day.

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.