HELP! Two spherical objects have masses of 1.5 × 105 kg and 8.5 × 102 kg. Their centers are separated by a distance of 2500 m. What is the gravitational attraction between them?

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

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.