# Tag Info

## Hot answers tagged acceleration

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### Why do rockets have multiple stages?

The basic reason: tossing an extra stage can be far, far, more of a mass-savings than trying to make one stage that can do everything. There's a handful of reasons for this: Engines weigh much less ...
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### Why did the space shuttle's altitude go down after reaching 108,000m?

The drop in acceleration around 40s into the flight is the shuttle throttling down to reduce the aerodynamic load on the vehicle. It then accelerates when past this point. The drop in acceleration at ...
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### Did any spacecraft ever use the Sun's gravity for acceleration?

It doesn't really work that way. We can use the Sun to change direction, but we need rocket thrust to increase speed with the msneuver. To begin with, the closest stars (apart from the Sun) are not ...
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### Did any spacecraft ever use the Sun's gravity for acceleration?

The "gravitational" (slingshot) maneuvers space probes are performing are actually not so much about gravity. The gravity is method to "tie" temporarily these two bodies, but you could (purely ...
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### How to account for burned fuel mass when calculating spacecraft acceleration?

The quantity you ultimately need when planning your manoeuvre is change in velocity, which in spaceflight terminology is called delta-v, $\Delta v$ (searching this term would give you a lot of ...

### Why do rockets have multiple stages?

Then why not use only 1 stage? Because we don't know how to do that. That we don't know how to do make a single stage to orbit is a consequence Tsiolkovsky rocket equation and of the fact that some ...
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### How do vibrational isolators reduce the g-forces of a payload on a launch vehicle?

The g-forces from the rocket's acceleration remain unaffected, of course. What the vibrational isolators do is isolate the payload from vibrations. Without them, the payload would experience both the ...
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### SpaceX rocket strange velocity

Two possibilities: The Earth rotates at about 465 m/s at the equator. This video's measurements could include that speed, though I don't believe so as it starts from 0 m/s. Most likely it's because ...
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### How much acceleration g-force can prevent pilot from moving their arms?

According to the book Human Engineering guide for Equipment Designers, authored by Wesley E. Woodson and Donald W. Conover and published by the University of California Press, suggests the following ...
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### Why do rockets have multiple stages?

Other answers address the core construct of the rocket equation with words and equations, but here it is visually: Where the Y-axis is the $\Delta V$ and the X-axis is the propellant mass. $b$ is a ...
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### Did any spacecraft ever use the Sun's gravity for acceleration?

I think the question is based on a misconception about how gravity assists work. If you just let yourself get pulled to a distant object then continue out the other side, the same gravity that ...

### Are we actually that close to techniques of accelerating probes to speeds like a quarter $c$?

Given that the interstellar medium (ISM) has a density of about 1 atom per cubic centimeter and given that laser propulsion could, in theory, accelerate a spacecraft to 30% of the speed of light in ...
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### Could you survive very high G's if your whole body was accelerated uniformly?

Of course. (if you replace that pesky "infinite" with "arbitrarily large", physics really really hates infinite forces) Who said you (and everything around you), is not currently ...

### Orbital Railgun for launching deep space probes

Let's look at some numbers. For the sake of argument let's target a delta-V from the railgun of 4 km/s enough to get to low lunar orbit or Mars transfer orbit. If the railgun is 1km long, that would ...
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### Orbital Railgun for launching deep space probes

Concepts for mass-drivers or railguns situated on the moon exist. What you're asking about is a mass driver space station in low earth orbit that a payload or ship launched from earth can dock with, ...
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