Question

Question #1ade4

Answer 1

The "thrust" of a rocket is primarily the rate of mass ejection from the nozzle.

Explanation:

The fuel used, the nozzle configurations and the combustion mechanisms and energies are all variable. Everything from solid boosters (controlled explosives) to kerosene to liquid hydrogen has been used.

The energy per gram of a specific fuel can be calculated from chemical thermodynamics. But the amount of that energy that is directed as thrust can vary a great deal. It is a bit more difficult than simply calculating the amount of energy required to move a mass from earth's surface to a stable orbital distance (or beyond).