Your friend Greg is planning to get in shape so he can try out for the football team next year. He has not exercised regularly since he injured his left knee over two years ago in a skateboarding accident, but he is planning an intense and vigorous exercise regimen. Write a letter to Greg giving him some advice on getting back into shape safely considering his past. << Read Less

What happens to the light rays when they hit the specimen?

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.

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?