Can someone please explain to me or give me links to find the answers of the following questions?
1. How does a spaceship counter gravity?
(what are the chemical reactions involved in making all those rocket propellants.)
2. Is the mass of the payload directly proportional to how high a rocket ship will go?
for example if a 50kg rocketship goes 2 miles up, will a 100kg rocketship go 4 miles up?
my guess is "no because gravity pulls 9.8m/s/s" but I want exact numbers on proportions
3. What other methods are there other than rockets to significantly escape Earth's gravity?
note: these questions aren't homework or anything. I just want links or direct answers to the questions. Thanks.