gravity and air resistance questions

Junior high studetn needs help with understanding concept behind grvaity. Help with following basic questions in simple terms please. 1. Imagine you started to walk towards the west. Imagine that you can walk forever and that you can even walk on water. If you walk in the same direction forever, what will happen? Where will y ...continues

Black hole accretion rate problem

Hello See attached for full question. It is basically a problem asking me to manipulate an equation using the Eddington accretion rate and calulating some of the constants. i have made a few notes and would appreciate any explanations of the maths required. thank you