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What is the relationship between the energy expended, the useful work done, and the efficiency?isukatphysics69 said:
energy expended divided by work is efficiency?haruspex said:
Would that tend to produce a value > 1 or < 1?isukatphysics69 said:
it depends thoharuspex said:
Will the work expended be more or less than the useful work done?isukatphysics69 said:
So what would be a sensible way to define efficiency?isukatphysics69 said:
so 35/100 particles of rocketfuel are usefullharuspex said:
so total energy expended was 19800 jules. only 35 percent of that is used efficiently so out of the total 19800 6930 was put to use that's what i thoughtharuspex said:
No. How did you calculate the 19800 J? Go back and check.isukatphysics69 said:
oh yea ok so the change in chemical potential energy was 19800 joulesharuspex said:
There are the following quantities of work...isukatphysics69 said:
They all have to do with energyharuspex said:
No, I mean what equations relate them. Some are equal, some add up to equal others...isukatphysics69 said:
haruspex said:
Yes.isukatphysics69 said:
No. Look at how you calculated 19800J in post #1. I see nothing about chemical PE there.isukatphysics69 said:
You left out GPE gained.isukatphysics69 said:
ok there is a mistake there both sides should be multiplied by negative 1 so CPE final - CPE initial will be ΔCPEharuspex said:
No.isukatphysics69 said:
A rocket can change its chemical energy through a process called combustion. This involves burning a fuel, such as liquid hydrogen or kerosene, with an oxidizer, usually liquid oxygen. The chemical reaction releases energy in the form of heat and gas, which propels the rocket forward.
The change in chemical energy of a rocket is affected by several factors, including the type of fuel and oxidizer used, the efficiency of the combustion process, and the amount of fuel consumed. The design and construction of the rocket also play a role in determining the change in chemical energy.
The change in chemical energy directly impacts the flight of a rocket. As the chemical energy is converted into heat and gas, it creates a thrust force that propels the rocket forward. The greater the change in chemical energy, the greater the thrust and acceleration of the rocket.
Yes, the change in chemical energy can be controlled during a rocket launch. Engineers carefully calculate and adjust the amount of fuel and oxidizer needed to achieve the desired change in chemical energy and thrust. This is crucial for a successful launch and to ensure the rocket reaches its intended destination.
After a rocket has been used, the chemical energy is completely converted into heat and kinetic energy. The rocket's fuel and oxidizer are depleted, and it can no longer generate thrust. The rocket will continue to travel in a parabolic path until it returns to Earth or enters orbit around a celestial body.
