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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Can the Tsiolkovsky rocket equation be translated directly into two dimensions with constant gravity?

By taking the Tsiolkovsky rocket equation $$ \Delta v=v_{\mathrm{e}} \ln \frac{m_{0}}{m_{f}}$$ where $ v_e $ is velocity at which mass is being dispersed, can the same be done with vectors such that $...
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Confusion about energy conservation

Suppose a rocket at rest turns on its jet and is now moving with kinetic energy $\frac12 mv^2$ in the lab frame. Suppose the efficiency was maximum so that exactly $\frac12mv^2$ of chemical energy was ...
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Is it true that a machine that generates thrust without blowing anything out not invented yet?

If yes. Am I correct to to say such machine does not conflict with the law in Physics and thus, it can be possibly invented? I mean a machine that does not rely on external forces such as a machine ...
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Why it takes more energy to pull satellite towards Earth than pushing it away?

Newton's law of motion states that satellite in orbit stays in orbit unless external force is applied, so we shall apply the force through it's thruster to deorbit. Strangely, it takes more energy to ...
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Finding parameters of a Gravitational Assist

I am trying to answer a simple question: If a rocket performs a gravitational slingshot around a body of mass m, altitude h, and angle $\theta $ and initial velocity ${ v }_{ sun }$, what will be the ...
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Derivation of the rocket equation [closed]

I have read many different rocket equation derivations but I do not understand them. Here is my derivation: At time $t$, assume we have an accelerating rocket with mass $m$ and velocity $v$. At time $...
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How can I create an equation that gives the maximum altitude of a water bottle rocket? [closed]

I’m doing my extended essay on the physics of a water bottle rocket. Particularly the maximum flight altitude and what amount of water will give this result. I’ve been working for weeks, going ...
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The Vertical Launch of a Rocket

From Q7 on Pg.22 of "Upgrade Your Physics" by BPhO/Machacek A rocket of initial mass $M_0$ is being launched vertically in a uniform gravitational field of strength $g$. (a) Calculate the ...
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Maximum Speed for Space Travels

Considering a hypothetical spaceship that has an unlimited amount of fuel, traveling within the solar system planetary plane, what would be considered a safe maximum speed for traveling around ...
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How is a rocket modeled?

I hear that rockets are "not pushing back on anything" but I couldn't find any clear explanation of what they push and what push back occurs. They expel matter but then the limit of what's "the ...
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Is the trajectory of a fire rocket inherently chaotic?

All of you: a happy and physics-rich new year! When I looked at the firing rockets launched at 00:10 2020, most of them went straight up. Some exploded before time. Some made strange movements. So ...
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Why doesn't NASA try using high-explosives to fuel rockets?

For a smoothly burning liquid-vapor mixture, I understand that burning hydrogen and oxygen is the best possible solution, not just for now but even theoretically. (?) But I read about ideas, that ...
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Calculating Rocket Engine Power from Force and Burntime

I am struggling to relate power to force. The example that I am working on in my head is a model rocket. This model rocket (sans engine) has a mass of 50g. Its engine has a mass of 10g (for the ...
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Boost to satellite in elliptical orbit in order to reach the maximum radius? [closed]

If there were a satellite in an elliptical orbit, at what point in its orbit should a booster rocket be fired to kick it to its max radius? I was thinking whennit was closest to the plant/object ...
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How can I isolate the drag constant (C) for vertical motion with quadratic drag from the equation for peak height?

Some background on my problem: I have calculated the peak height of a rocket (with quadratic drag). As this will be used for a PID software application, I need to have the equation be expressing peak ...
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How to calculate pressure exerted by a rocket's exhaust on a surface from a certain altitude?

How do you calculate the pressure that is exerted on a surface (say from a rocket engine) at an arbitrary altitude? For example, pretend I know the exit velocity and pressure of a rocket engine at an ...
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On two requirements in order for an equation describing the propulsion of a rocket to hold

A rocket moving with a velocity $v$ releases a mass $\Delta m$ (fuel exhaustion) at a speed $v_{0}$ in a time interval $t$ and $t+\Delta t$, and increases its velocity by $\Delta v$. If we apply ...
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Spacetime and its contribution to space science

Does the launching of a satellite need the consideration of the general theory of relativity (GR)?
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Why can't we fly aeroplane or shuttle directly into the space (beyond 100 km height above Earth's surface)? [duplicate]

Without rockets can we go beyond Karmans line by shuttle or plane?
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NASA's “Impossible” Space Engine, Take Two [closed]

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 [closed]

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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72 views

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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535 views

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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116 views

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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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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119 views

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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272 views

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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207 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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112 views

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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328 views

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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