No, rocket fuel is liquid Hydrogen and liquid Oxygen, both of which are abundant and just require energy to extract from water and/or the atmosphere.
The fuel that provides the energy might be limited however ;)
Only two: solid liquid fuel
This depends on the fuels used (Liquid Oxygen, Hydrazine, etc) the design contours of the nozzles (if we are talking about liquid fuel rocket engines, and pressure pumps, turbo-chargers etc in the rocket body. The velocity of the rocket is dependent on a good many factors including the chemical reactions of the fuels themselves, the specific impulse as it is called, and as with autos, transmission losses due to plumbing and pipes.
The thrust, which is the force on the rocket due to air. When the fuels are burnt, air (including burnt fuel) is pushed downwards. From Newton's third law, the air exerts an upward force of equal magnitude on the rocket.
Rocket fuels are any of the substances or mixtures of substances that can burn rapidly with controlled combustion to produce large volumes of gas at high pressures and temperatures. Fuel for the space shuttle is almost entirely liquid O2 (liquid oxygen) and is pale blue.
Dr. Robert H. Goddard a New England physics professor created the first liquid fuel rocket using liquid hydrogen and liquid oxygen, the same fuels used today to power the space shuttle main engines.
There are solid rocket fuels, and there are liquid rocket fuels.
the solution that can prevent fossil fuels from running out?
Rocket fuels are used. It contains chemical energy
The name of a common rocket fuel is liquid hydrogen, which is often used in combination with liquid oxygen. There are also other types of rocket fuels including solid fuels and hybrid fuels, but liquid hydrogen is one of the most commonly used.
There are various types/combinations of rocket fuels. The most popular one is Hydrogen which was used by the Space Shuttle. But there are some hydrocarbon fuels as well that are used in rocket engines (for example RP-1 used by the Soyuz rocket). By asking specifically about rocket fuel I assume that you make the distinction between fuel and oxidizer (because a rocket engine generally uses both fuel and oxidizer in contrast with gas turbine engines who takes its oxidizer from atmospheric air). All in all, the answer is not as straight forward as you might expect: certain rocket fuels (see RP-1 like fuels) are very similar to jet fuel so they can be used as fuels in gas turbine engines. Other fuels like hydrogen or hydrazine can't be used in current gas turbine engines. But it is not impossible to have in the future gas turbine engines that uses hydrogen or some other fuels used in rocket engines.
replace solid fuels- easily combustible!
Only two: solid liquid fuel
liquid hydrgen and other things..... daaaaa!!!!!!!
This depends on the fuels used (Liquid Oxygen, Hydrazine, etc) the design contours of the nozzles (if we are talking about liquid fuel rocket engines, and pressure pumps, turbo-chargers etc in the rocket body. The velocity of the rocket is dependent on a good many factors including the chemical reactions of the fuels themselves, the specific impulse as it is called, and as with autos, transmission losses due to plumbing and pipes.
running
Because they are running out.
Fossil Fuels predict to run out withing 50-55 years