Questions tagged [acceleration]

Questions regarding acceleration - the rate and/or direction by which an object's speed or velocity vector changes with respect to time.

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10
votes
2answers
833 views

Challenging the Kármán line from above

The initial conditions of the thought experiment is (very) LEO / reentry. capsules, space shuttle and other spacecraft can generate lift in upper atmosphere during reentry, in order to reduce ...
5
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1answer
101 views

How was InSight's vertical seismometer (accelerometer) tested in Earth's stronger gravity?

The BBC article InSight Diary: The silence of space tells an interesting story and has an interesting audio recording of InSight's seismometer signals sped up to audio frequency, made while in ...
3
votes
2answers
661 views

What is a non-propulsive vent?

I just hear the term "non-propulsive vent". Is it a thing, a vent that does not cause propulsion? Or is it an event, where a vent of some unwanted gas has occurred which did not result in a ...
11
votes
2answers
611 views

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

As recent research has been started by a team around Stephen Hawking under the name Breakthrough Starshot they are going for accelerating little probes up to 0.2~0.25$c$. There isn't that much ...
6
votes
4answers
2k views

Orbital Railgun for launching deep space probes

I've perused some of the articles and questions on magnetic acceleration using rail guns and they all seem to say that it's possible just not practical. I wanted to know what are the drawbacks to ...
4
votes
2answers
623 views

Outgassing as a viable explanation of Oumuamua acceleration excess

A recent paper on Oumuamua claims the following: 'Oumuamua (1I/2017 U1) is the first object of interstellar origin observed in the Solar system. Recently, Micheli et al. (2018) reported that '...
2
votes
1answer
311 views

Did the Perseverance rover's Atlas 5 really “leap off the pad”? If so, was it because the payload is tiny, or because it's going to Mars?

Spaceflight Now's ULA’s Atlas 5 is NASA’s go-to rocket for nuclear-powered space probes quotes Tory Bruno, president and CEO of United Launch Alliance: “This rocket is going to leap off the pad with ...
8
votes
2answers
664 views

What do ISS astronauts do while the ISS gets reboosted? [duplicate]

For its orbit to not decay, the ISS reboosts itself to higher altitudes once in a while. During the reboost, I wonder how much gravity is felt by the astronauts onboard, and what do they do to avoid ...
12
votes
2answers
2k views

How much acceleration g-force can prevent pilot from moving their arms?

Assuming that the craft’s engine is capable of any amount of acceleration, how much g-force would prevent the pilot from being able to move their limbs in order to control the space craft? There is ...
5
votes
2answers
9k views

How do I calculate a rockets burn time from required velocity?

Say my rocket could produce F newtons of thrust while consuming M1 kilograms of fuel per second. It's mass at start is M0, and it keeps burning until it reaches V velocity. How would I find out the ...
7
votes
1answer
683 views

What precisely was the character of the non-gravitational acceleration of Oumuamua?

When exactly did Oumuamua accelerate, when did it begin, when did it end, was it uniform across that period, and at what vector did it occur? I've seen some vague references to it lasting 100 days, ...
0
votes
0answers
19 views

Which nD accelerometer symmetric configurations on a cubical LEO spacecraft can serve as a makeshift 3D gyro resolving tumbling from tidal forces?

As they often do @DavidHammen's comment has got me thinking about the following question, which is a mathematical exercise rather than a realistic scenario. On a hypothetical large cubical spacecraft ...