Neutron stars are some of the densest object in the universe. They form during supernova explosion and are very small compared to other astronomical objects. You can assume 5x10^17 kg\m^3 as the average denisty of a neutron star. The Earth has a total mass of about 5. 97x10^24kg. What would be the diameter of the Earth if it had the density of a neutron star?

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

Two polarizers are oriented at 24.0∘ to one another. light polarized at a 12.0-degree angle to each polarizer passes through both. what is the transmitted intensity (%)?

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.