Rocket Definition and 1000 Threads

Imagine I have a rocket with a certain amount of energy stored as chemical energy, let's say its 10Js, that exhausts itself after 5 seconds. If I attach this rocket to a (relative to an observers frame) stationary cart in such a way that it pushes the cart, it will add 10J of kinetic energy to...

I want to drop a rocket-shaped object from a near-space balloon, with the aim of maintaining a downward acceleration that leaves it's contents in microgravity. I think that this means: The (unpowered) rocket needs to maintain as close to 9.8m/s2 acceleration in order to balance out the...

Homework Statement A rocket ship leaves Earth at 0.6c. The clock of the rocket says 1hr has elapsed. (a.) According to the earth clock, when was the signal SENT? (b.) According to the earth clock, how long after the rocket left did the signal arrive BACK on earth? (c.) According to the rocket...

What implications will this have to: South Korea, the world. http://www.bbc.co.uk/news/world-asia-35516278

Okay guys I am studying variable mass systems and rockets,as such I was introduced to the formula v=u*ln M0/M where v is the velocity of the rocket after a time t M0is the initial mass of the rocket,M is the mass of the rocket after time t u is the velocity of the ejected gas w.r.t to the...

I'm pretty new to this forum but have loved sciences if all kinds since I was young and plan to get into nuclear engineering after high school. Back on topic, I have made a rocket launcher out of pvc pipe that is powered by an air compressor. Ranging from 60-120 psi propelling my paper rocket...

I would like to preface this by saying that I do not in any way resemble a physicist - and I'm sure the crudeness of my work will confirm that, but I thought that this was so cool, I wanted to share it. I'm just a follower of physics. I understand that some of the concepts I'm going to be...

Question: A 7750 kg rocket blasts off vertically from the launch pad with a constant upward acceleration of 2.35 m/s^2 and feels no appreciable air resistance. When it has reached a height of 555 m , its engines suddenly fail so that the only force acting on it is now gravity. Part B: How much...

To calculate velocity of the rocket: v1=m2/m1 × v2 where v1 and m1 is mass and velocity of rocket and v2 and m2 is the mass and velocity of fuel. Problem: m1 is saying that you have to decrease the mass of the rocket and increase the mass of fuel. But if you decrease the mass of rocket, the...

Hi, I can´t understand how a rocket is not flipped over by the thrusters (especially without finns). I know this is a general misconception of how a rocket works, but it seams intuitive that it would behave like a inverted pendulum, since the force works below the center of mass, of the rocket...

So I was reading about the challenger disaster and came across this report: http://history.nasa.gov/rogersrep/v1ch3.htm Both the Shuttle main engines and the solid rockets operated at reduced thrust approaching and passing through the area of maximum dynamic pressure of 720 pounds per square...

Is it possible (practical/efficient) to utilize ramjet (or scramjet) on a vertical rocket? By this I mean would it be at all practical to make a vertically traveling rocket which partially uses ramjet as a method of propulsion, or is there some property of ramjet propulsion that makes this...

Y'know, just because. Will it be possible to create a rocket engine using isopropyl alcohol as fuel? Why or why not? (will be used just for show and not really for sending ships to space. I'd rather have an entire school intact than it being blown to bits if I used hydrogen)

I was pondering Mars missions and wondered about what kind of vehicle an astronaut on Mars would need in order to get home. My first thought was that Mars gravity is .38 that of earth, so he would need a rocket about 38% as large to get off of Mars as he needed to get off of earth, This of...

What is the first and last name of scientist to patent trademark a rocket? (Example 1) :Thomas Edison Invented the lightbulb: (Example 2):Alexander Graham Bell Invented the phone:

Homework Statement m=100gr g=9.81 m/s2 H=75m Combustion of gunpowder = 2.7x10^6 J/Kg This would mean we only need 0.2gr of gunpowder to get 75m high. Why is there in a normal rocket more gundpowder? Our physics and chemistry teacher checked my calculations but couldn't find a mistake, so what...

http://www.businessinsider.in/Elon-Musk-congratulates-Jeff-Bezos-for-his-amazing-rocket-landing-and-reminds-everyone-that-SpaceX-is-still-ahead/articleshow/49911572.cms http://arstechnica.com/science/2015/11/jeff-bezos-and-elon-musk-spar-over-gravity-of-blue-origin-rocket-landing/ Private...

Homework Statement [/B] I was wondering if you'd be able to help me with this problem: Given a two-stage launch vehicle with an engine that produces an Isp =400 sec, a payload mass of 10.000 kg, stage 1 structure mass of 10.000 kg, stage 2 structure mass of 10.000 kg, determine the mass ratio...

Homework Statement A rocket starts from rest and moves upward from the surface of the earth. For the first 10.0 s of its motion, the vertical acceleration of the rocket is given by ay=(2.90m/s^3)t, where the +y-direction is upward. What is the height of the rocket above the surface of the...

So off to Mars we go. But really how are we going to get there? The most expensive part of space travel is overcoming atmosphere. So you could say the biggest obstacle of space travel is Earth travel. It takes virtually no energy to cross space but it takes massive amounts to get into space...

RocketShip, yep that's the name I was given ironically enough. I'm not much for math but I love philosophy and critical thinking. I'll come up with ideas you come up with solutions :P my biggest interest at the moment is how to get the masses into space.

Homework Statement A student experimenting with model rockets measures the speed of a vertically-launched rocket to be 18.0 m/s when it is 75.0 m above the ground on the way up. The rocket engine fires from when the rocket is at ground level to when it is 8.75 m above the ground. If the rocket...

Hi there. I'm new to the forum. I apologize if I'm posting at the wrong session. Anyway, here goes the problem: (sorry for any grammar typos). A solid fuel rocket, home constructed, has initial mass 10 kg; this, fuel is 8 kg. The rocket is launched vertically, from rest; burning the fuel at a...

Homework Statement Hi. I'm in high school physics, and as I'm only 2 months in, I still don't know much. We launched a model rocket as an experiment and I need to find the thrust after adding 100g of mass to the rocket's body. The engine is an Estes A8-3. My teacher told me that its thrust is...

Homework Statement A 590 kg rocket is at rest on the launch pad. What upward thrust force is needed to accelerate the rocket uniformly to an upward speed of 28 m/s in 3.3 s? Homework Equations V = Vi + at F = ma The Attempt at a Solution I'm just confused about what "thrust force" actually...

Homework Statement A 2.49×104-kg rocket blasts off vertically from the Earth's surface with a constant acceleration. During the motion considered in the problem, assume thatg remains constant. Inside the rocket, a 14.5-N instrument hangs from a wire that can support a maximum tension of 37.3 N...

Homework Statement An instrument carrying rocket accidentally explodes at the top of its trajectory. The horizontal distance between the launch point and the point of explosion is L. The rocket breaks into two pieces that fly apart horizontally. The larger piece has three times the mass of the...

Homework Statement Problem : During your summer internship for an aerospace company, you are asked to design a small research rocket. The rocket is to be launched from rest from the earth’'s surface and is to reach a maximum height of 990 m above the earth'’s surface. The rocket’'s engines give...

Homework Statement A radar device detects a rocket approaching directly from east due west. At one instant, the rocket was observed 10 km away and making an angle of 30 degrees above the horizon. At another instant the rocket was observed at an angle of 150 degrees in the vertical east-west...

Hi! So I'm a college student and I was looking at trying to get together a group to compete in NASA's student launch initiative. However I don't really know anything about rocketry and don't know where to start. I'm currently studying mechanical engineering and planning on emphasizing in...

Homework Statement I have the time and distance measurements. We shot it straight up, how can I find the altitude and angles? Times: (6.58 sec, 23 m), (6.90 sec, .6 m) (6.20 sec, 10 m). The time represents how long it takes for the rocket to shoot up and fall, the distance is the measurement...

By Newton's first law of motion, every object will continue to be in state of movement or rest, until acted upon by external force. Now, why can't a rocket continue to travel after it was initially thrusted (do not know if its right word) by fuel ? like a satellite that is set in orbit with some...

Homework Statement A model rocket takes off from ground level accelerating upward at a = 3.0 g. This upward acceleration lasts for a time τ = 15 s. Afterward the rocket continues upward, eventually stops rising, then falls back to the ground. How much time passes from the initial upward...

Homework Statement A truck hauling a big tank of oil starts at position x=D (Chicago) and heads due west (–x direction) toward its destination at x = 0 (Des Moines). At Chicago, the total mass of the loaded truck is M and the mass of oil it is carrying is λM. (Thus M(1–λ) is the "tare" mass =...

This is perhaps a somewhat naive question about rocket exhaust. If I understand correctly, one of the challenges in designing a rocket nozzle - say, the main thrusters for the Saturn V - is that it needs to operate efficiently at sea level as well as at altitude. The difference in air pressure...

Homework Statement A 25 kg Rocket generates 400 N of thrust. It is designed to burn its fuel for 40 seconds. If launched vertically what will its final vertical velocity be when the fuel runs out? How high can it fly? How long until it reaches the ground? Neglect mass of fuel, and air...

I know calculus, multivariable calculus and classical mechanics. So, I'm thinking about doing a project about rockets, so I'm looking for sources to learn about Rocket Science. Do you know good sources, like courses, books... for a 15 years old?

Homework Statement A 200 kg weather rocket is loaded with 100 kg of fuel and fired straight up. It accelerates upward at 30 m/s^2 for 30s, then runs out of fuel. Ignore any air resistance effects. What is the rocket’s maximum altitude? Homework Equations Δx=V0t+(1/2)at2 V=V0+at 2aΔx=V2-V02...

(a) Newton's I law : a body will move without stopping unless any force acts. (b) There is no air in space, hence no aerial friction. From (a) and (b), how can a rocket stop in space? How it applies brakes?

inb4 "google it", I did. There aren't a lot of information about this topic. Can a Hot Water Rocket or a Steam rocket ever succeed to reach outer space? I can calculate the exhaust velocity by determining the change in enthalpy I guess but I don't in which state will it exist in and how can I...

Dear Physics Forum, I really don't understand the concept of watt and Newton. I have two questions, perhaps someone can explain it to me. ======================================================= Case 1: If a one Newton force is applied to a one kg rocket in space with no or very little effect of...

Assume that a satellite(mass m) is orbiting the Earth(mass M) at radius R and speed V (the orbit is circular). The satellite is in a position such that the force of gravity exerted on it by the planet is not enough to keep it in orbit. Therefore, the satellite has an engine, which always points...

I've been trying to figure this out for days. I'm told that atmospheric pressure imposes a limit on maximum possible exhaust velocity in the Earth's atmosphere, and that under STP conditions that limit is approximately 15,000 feet per second. But that doesn't make any sense. Suppose you had...

Trying to calculate the net thrust of a rocket taking into account the force due to gravity. So I presume this is the calculated Thrust minus the force due to gravity. Known data so far is that the rocket gets to escape velocity (11,200 m/s) after 5 minutes (300 secs). Acceleration for this is...

I have a question concerning gravitation potential energy and rockets under an unusual situation. Let a rocket be in a gravity well of a massive object such as a planet. For simplicity, assume that the rocket is in a vacuum. (we can add air effects later). The rocket engine thrust is dynamically...

Antimatter can be contained in magnetic fields; what if we could somehow "propel" that magnetic field by using a magnetic nozzle when the small antimatter-matter reactions/annihilation occurs which produces thrust? This seems like a really stupid idea, but can you tell me some limitations about...

I really can't seem to wrap my head around why the specific impulse on a rocket is so much lower than that on a jet. I know a jet engine has a larger supply of oxygen, but I don't see why that has such a huge effect. I also know exhaust velocity plays a large part, but I would have thought that...

So,while learning mechanics,I found that most questions use g=-9.8 ,but when calculating the velocity the instant a rocket touches the ground,the solution instead used g=9.8,which is very confusing.Other questions of similar workings used g=-9.8,anybody care to help?

Note: I have noted that one of the formulas I have provided does not show up on my webpage in preview mode and so have also made it as an attachment. Quick summary: I have found two different websites that offer the equation that I am looking for in different forms, but I am starting to think...

Hi Everyone. I am trying to simulate a rocket combustion chamber. The question I have is this. Is the ignition (by any means) in the rocket combustion chamber only used for increasing the temperature of the cryogenic propellant to a state where it can ignite and burn? If you are using an...