A Mars Spacecraft, flies over at a geopotential altitude of 80 Kilometres. What is the geometric altitude in metres?

Why is there friction between objects

Two polarizers are oriented at 40∘ to each other and plane-polarized light is incident on them. if only 16 percent of the light gets through both of them, what was the initial polarization direction of the incident light?

Which branches of natural science include the study of an organism that lived 10 million years ago