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Questions tagged [rocket-science]

Colloquially referred to as one of the hardest professions, rocket science is actually a common name for spacecraft/space-systems engineering. However, one can also generalize this to include all forms of rocketry, including rockets that are not capable of space travel.

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73 views

NASA's “Impossible” Space Engine, Take Two [on hold]

This question seems to be a close parallel of this one, but it's about a different design by a different author. I read a news article about a "helical engine" design by NASA engineer David Burns. ...
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Black hole Travel [on hold]

Asking out of curiousity. All answers appreciated. You have a machine that generates micro black holes on the outside of it which evaporate quickly and then are immediately generated again upon ...
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Free return trajectory versus burning rocket

It is said that Apollo was set to the free return trajectory while leaving earths gravity, heading to moon.Now the Free return trajectory is the one in which satellite uses moon gravity to return back ...
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Why is the body of the rocket so long and does it effect the flight?

so my qustion is that why are rockets body so fricken long it is crazy all the rockets body are so very long and I need an answer to the question please tell me it is for science and i really need ...
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Escape velocity and orbital velocity confusion

If orbital velocity is reduced when we want to put a satellite in a higher orbit, and if to achieve a lower orbit we need to increase it's velocity, then how come by increasing the speed of the ...
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Inserting Wind effects on a rocket trajectory simulator

I`m more used to the math.stackexchange so i really don't know how much information about my problem i should provide, if it is not enough i'll add more. So, basically i already have a 6DOF ...
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Water Bottle Rocket Thrust - two calculation methods not matching

I have been launching water bottle rockets with my kids and we are in the process of creating a simulation of the launch using numerical methods. I am a mechanical engineer, but fluid dynamics is not ...
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What is actually breaking the ozone layer?

My question is about the ozone layer. Is it possible that sending rockets out to space can damage the ozone layer?
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Structure of Mach diamonds in supersonic and hypersonic flows (SpaceX raptor engine video of Sept. 28, 2019)

Last night, SpaceX held another show and tell, and there was a nice long, almost 1 minute burn of a raptor engine. The flow stabilized really nicely, and you get an absolutely fantastic view of the ...
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Can a nuclear weapon destroy another nuclear weapon in flight? [closed]

I was thinking the other day, we have quite a few nuclear weapons in our arsenal. Say a country uses ballistic or cruise missiles on us. Can't you send up another nuclear weapon and detonate it within ...
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Dominant component of drag in a streamlined body (sounding rocket) at 0.8 Mach

We are currently working on CFD solutions on ANSYS Fluent for the drag on our sounding rocket. We are modeling its drag profile through out its velocity range. We currently hit a top speed of approx ...
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Can we deorbit space trash into the sun by splitting it in two?

So there's an issue of deorbiting stuff because if you just deorbit it a little, it'll enter a more elliptical orbit but still hit you in the back when you return to this place a year later. Size and ...
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How does adding high energy density metallic nanoparticles increases the burning rate during a combustion process?

I have been reading about combustion and oxidation, and I have found out that by adding metallic nanoparticles (e.g aluminium nanoparticles) the burning rate of the propellant increases while the ...
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Why aren't spaceships (usually) torn apart

This may have already be ask forgive me if it has but why aren't spaceships torn apart when in the vacuum of space? Is it just because they are strong enough not to be torn apart or because they are ...
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Will a can filled with vacuum move when we let in air? [duplicate]

This picture is from L.C.Epstein's book Thinking Physics. The upper can is filled with compressed air, and, when an opening is made on the right, the air comes out and the can shoots left. The ...
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is effective exhaust velocity constant

I'm trying to create realistic rockets for a game project. To calculate $\Delta v$ I'm using the equation: $$\Delta v = V_e \ln(MR).$$ For $V_e$, (effective exhaust velocity) can I plug it in once or ...
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Can rocks be used to propel rockets? [closed]

Can rocks and soil, or simply any other common form of matter with a mass, be vaporized in a nuclear thermal rocket at high temperatures to provide thrust for the rocket? Wouldn't that be convenient ...
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Could an electric centrifugal fan in space be used to propel a substance to create force?

Would an electric centrifugal-force fan (like that found in a blower motor) work in space to create force, by putting a substance (like silica sand or something slippery) through the centrifugal fan ...
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Deriving the Tsiolkovsky Rocket Equation using the rate at which the fuel burns

I'm trying to understand the derivation of the Tsiolkovsky Rocket Equation. $$\Delta v= \int_{t_0}^{t_1} \dfrac{|T|}{m_0 - t\Delta m}dt$$ The Wikipedia page ...
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Would deuterium or tritium be a better rocket fuel? [closed]

Im not that scientifically literate but through my basics as hell understanding of chemistry is that denser=better wouldn't the denser forms of hydrogen be better for fuel since they would weigh ...
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Is it possible to use Bose-Einstein condensate for propulsion with today's tech?

Can one use the Bose Einstein condensate which we can produce today for space propulsion, as many theoretical concepts need negative mass and that is a property of Bose Einstein condensate, how ...
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133 views

Is kinetic energy relative? [duplicate]

Assume there is a rocket with 10 kg of fuel in a large empty space without any external forces such as gravity. Rocket burns 1 kg of fuel and gets a $v_1$ velocity gain. Now it is moving in $v_1$ ...
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When trying to find the optimal volume of water for a bottle rocket, do I use constant or increasing pressure?

I am conducting an experiment to find the optimum amount of water for a given rocket. For each trial, do I keep the pressure same or do I increase pressure with increasing volumes.
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Reaching outer space using earth's air pressure, then rockets

Please correct me in my methodology if I am wrong, I am only in Physics I right now... This question has been daunting me for some time, but wouldn't it be a whole lot more efficient to send cargo ...
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Calculating the exhaust velocity using conservation of momentum [closed]

I was just wondering if i did this correctly $$p_{exhaust}=-p_{rocket}$$ $$m_{e}v_{e}=-m_{r}v_{r}$$ $$v_{e}=\frac{-m_{r}v_{r}}{m_{e}}$$ I used data from a Saturn V simulation by Robert A. Braeunig ...
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Variable acceleration relativistic rocket

I was wondering how a realistic fusion-or-something rocket would fly... More specifically, I wonder about the time dilation that would be experienced (say in the classic example of two twins). So, of ...
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Is the physics behind planetary travel simpler than atmospheric travel?

I've been watching a bunch of documentaries lately and had a question that I couldn't really figure out the answer to online. When spacecraft travel through space, are the equations and physics used ...
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Placement of the spaceports on our Earth

Why are spaceports located at certain points (site/place) on our Earth? Is there a physical reason I don't really know about?
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Where does the energy used to fight gravity go?

Imagine the following scenarios: A. We have a spaceship at x distance from a star. It faces directly away from the star, and fires its engines such that it ...
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How would one calculate velocity with respect to time in Case 2?

Case 1. : The rocket is weightless in space. It's fueled with propellant. It's wet mass is starting mass $m_s$ and dry mass final mass $m_f$. Suppose rocket's initial velociti is 0. The rocket ignites ...
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U-turn in Deep Space

While writing a physically realistic game ( "Asteroid Defender" ) a physical question came up whether Diag.1 or Diag.2 or Diag.3, correctly depicts reality. In deep space (away from other celestial ...
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Sound from a rocket

I have been watching programmes commemorating the Apollo 11 mission. One obvious feature of the launch is the sound. It was mentioned that water was sprayed into the pit below the rocket not (...
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Do I do zero net work if I start and stop a spaceship in vacuum?

As question states, I start and then stop a spaceship in vacuum by using orientable thrusters. In the acceleration phase, I am doing positive work, but in the deceleration phase I am doing negative ...
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Can you derive the Tsiolkovsky rocket equation without calculus?

Can you derive the Tsiolkovsky rocket equation without calculus?
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Why is the onboard trip shorter when riding on a relativistic rocket as compared to a Newtonian rocket? [duplicate]

In the top answer for this question on the Space Exploration StackExchange, it's calculated that a rocket traveling at constant 1g of acceleration over 100,000 light years would, under Newtonian ...
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How fast can we get to Alpha Centauri?

Suppose in the near future we send an Antimatter rocket that is capable of constant $1g$ acceleration to our nearest star, Alpha Centauri, $4.3$ light years away and suppose we want the spacecraft to ...
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Can you predict how much fuel you need to launch a rocket based on conservation of energy?

I was just wondering if there was a way to calculate how much fuel you need for launch, possibly to do with chemical energy to kinetic energy. Thanks
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Mass required to accelerate to relativistic speed

What would the rest mass of a rocket need to be if it carries a payload of 1kg and is accelerated to 1/2 c and then decelerated to a stop. Assume: 1 - energy required is obtained via fusion of ...
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Water from air concept – is this plausible?

Here’s an idea I had: Consider how a rocket stove works.. There is an inlet where wood is fed into the stove and an outlet for which the exhaust can vent. Very simple but very effective. Now apply ...
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Why do cylindrical rockets require a roll and pitch maneuver?

On the space shuttle, I understand that the quick roll and pitch maneuver wins because it increases payload, aligns antennae, etc. But if one looks at the Apollo missions on a Saturn V, why is this ...
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Change of orbit with tangential impulse

I see a similar question: Change of orbit with a radial impulse. The answer to that question seems fine to me. In the answer, mention is made of this similar question, but it is not fully treated. ...
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Why haven't we yet tried accelerating a space station with people inside to a near light speed? [closed]

Is that something we could do if we use ion or nuclear thrusters? Wouldn't people in the station reach 0.99993 speed of light in just ...
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Help with Gravity Assist [closed]

In our scenario, a spaceship of mass 70,000 kg and velocity $v_o$ is planning on slingshotting around Earth and we're supposed to find what the exit velocity will be. The Earth is the origin in our ...
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Can satellites stay in orbit when the Earth is being accelerated?

In a TV show I'm watching, the people of Earth have decided to leave the solar system, and take Earth with them, so they've built a large number of powerful rocket engines on one side of the Earth (as ...
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Could one theoretically use the expansion of the universe to travel through it? At least in one direction?

Could one theoretically use the expansion of the universe to travel through it? At least In one direction? That’s it that’s my question. I’m not a physicist but I do get ideas. I also wonder if one ...
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If fuel was provided by an autonomous side ship, how much fuel would be required for a 10 metric tons rocket to reach the ISS?

The point here is that the rocket weight should never include fuel. It can take off from any departure base of your choice. The fuel provided by the side ship would then be used only to lift the ...
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What percentage of a rocket fuel is used to lift fuel itself?

I don't need an exact number, also it can be to travel to the ISS or the moon, it's not important. I just want to get an idea of how much fuel is used in a «recursive» sort of way. Edit: I am asking ...
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How did most of the math and physics formulae that govern our lifestyle and help us in space exploration come into being? [closed]

I realise that this isn't a very academic question, but after watching movies like First Man and Interstellar, it got me wondering: How did all these formulas that we use on a regular basis come into ...
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What is difference between Impulse and Thrust in Physics/Rocket Science?

The question is clear. What is the difference between Impulse and Thrust in Physics/Rocket Science as meaning?
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Why don't we use ionized neon for arc jets?

On a typical arc jet there is a cone in the proppelent stream (ammonia or hydrazine) that acts as an anode and the the nozel itself is the cathode. But why don't we use ionized neon as the cathode and ...