This is my first question on the Physics portion of Stack Exchange. I was hoping to get some light on the topic of gravity. I don't have much background knowledge of physics so I might as well start here.
I have a few planet and gravity related questions:
1). Does planetary gravity depend on size or density? Or both?
2). Is it plausible for a large (very large), terrestrial planet to have tall mountains like Mount Everest or even like on Mars?
3). Is there a way, given an average density per cubic meter along with the average radius of the planet, to calculate the pull of gravity?
I've been scouring the internet for these things with no luck so far. The idea behind this is to make a planet rendering program which takes all of this into effect. If this forum doesn't answer this sort of thing, feel free to point me in the right direction. Thanks!