# Questions tagged [center-of-gravity]

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### How far is the solar system's center of mass from the sun? [duplicate]

We often say that the planets orbit the sun. But, in reality, they orbit the solar system's collective center of mass. How far is that point from the center of the sun?
1 vote
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Yet another kerbal question here. Background: I've built many SSTOs before, mainly small, light-payload or crew delivery ones (either boosted by a rocket or by itself). The reason why I've been shying ...
• 2,304
477 views

### Calculate rocket centre of mass

I wish to calculate the centre of mass of a two stage rocket, for example the Falcon 9. Since the mass of the rocket is constantly changing (first the mass of the first stage is depleting, then the ...
• 125
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### Which components do we calculate for center of pressure? Where is the distance of components while computing the cp and cg of a rocket?

everybody! I have 4 questions about center or pressure (cp) and center of gravity (cg) of a rocket system. Questions 1) While computing the center of pressure of rocket system, which components do ...
• 241
216 views

### Can a reaction wheel decelerate to add momentum in the same direction? [closed]

Can a reaction wheel shed weight to gain speed? Could a reaction wheel at its max spin be flipped or rearranged around 180 degrees then slowed to add to its velocity?
• 1
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### How is the CG of rocket found after the complete assembly

Using CAD modeling, the center of gravity of a rocket can be easily predicted. But in reality, after the assembly, the CG will not be exactly at the place given by the model because of difference in ...
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