Rocket Definition and 1000 Threads

Homework Statement A rocket with that has a proper length of 1100 m moves away from a space station in the + x direction at 0.60c relative to an observer on the station. An astronaut stands at the rear of the rocket and fires a dart toward the front of the rocket at 0.85c relative to the...

We need to design a model rocket from scratch that is resistant to crosswinds and keep its trajectory withing a target zone. Does anyone know any methods to keep a model rocket stable in windy conditions? My idea was to make the rocket rather heavy, to resist the force of the wind. Would...

State the fundamental equation of motion for a particle of variable mass. A rocket of initial mass m0 is fired vertically, under the influence of a uniform gravitational field, and expels propellant at a constant relative velocity c downwards. The propellant is completely consumed after a...

So, the rocket equation is F_ext = m(dv/dt) + u(dm/dt) where m is the mass of the rocket, v the velocity, u the effective exhaust gases speed, and F_ext the external forces on the system. If we take a constant mass ejection rate p, and take the external force to be the gravitational...

A model rocket with a mass of 0.50 kg is fired vertically from the ground. Assume that it is streamlined enough that air resistance can be ignored. Suppose it ascends under the influence of a constant net force of 2.0 N acting in a vertical direction and travels for 6.0 s before its fuel is...

If I have a rocket constantly accelerating at some rate a, (requiring some constant force F), I want to know how much work is done by the rocket to travel a given proper length. For example, a rocket traveling to alpha centauri at 1g acceleration half way and 1g acceleration the other half...

"Acceleration increased during S-IC flight for two reasons: decreasing propellant mass; and increasing thrust as F-1 engine efficiency improved in the thinner air at altitude." This is from Wikipedia, so who knows. Why would a thiner atmosphere increase the thrust efficency of the engine...

First off, let me say that what I am working on has taken me a few days to get to work and I just can't figure it out. It is really frustrating so any help is really appreciated. I have three igniters. They are connected to a circuit. Once a switch is turned to "on" the three igniters are...

I have questions: 1) twin 1 goes on a rocket flys to pluto at .99c and comes back to Earth (all uniform motion, somehow). When he gets back he sees twin 2 is older. But since twin 2 was moving away from him at .99c why doesn't twin 2 see him as older? 2) Why does something gain mass as it...

A rocket is moving upwards at 28.72 meters per second. Then, its engines are turned off. How much time will it take for it to come to a stop if it is traveling upwards exactly straight? Also, how far would the rocket have had traveled after its engines were shut off? The weight of the rocket is...

What is the Air/Propane mixture Ratio? The Fuel Air Ratio of a Jet Engine is 15 to 1. This is for JP4. What is the Fuel Air Ratio for Propane Gas? I have learned the only difference between a rocket engine and pulse jet engine is the pulse jet runs on the oxygen that is in the air (30%...

I thought this was pretty cool. A private company (Space Exploration Technologies) has started launching rockets for customers. Full story: http://news.yahoo.com/s/nm/20090714/sc_nm/us_space_business_2

If a rocket is traveling upwards at 40.24 meters per second, how long will it take until gravity (9.81 m/s) causes the rocket to stop and go downards? Also, if a rocket is traveling at 33.96 meters per second, and then its fuel runs out, and another rocket ignites immidiately after that at a...

I am trying to launch a rocket 200 feet away from the rocket. When the switch is thrown to "ON" the electrical circuit is turned on which sends an electrical current into the motors. I can launch the rocket just fine if I am standing right there to flip the switch, but as i increase the distance...

It is my understanding that when neon goes from a liquid to a gas, it has an expansion ratio of 1:1400. Would using N- and N+ be a realistic rocket fuel? I understand that it would take a lot of energy but is there a way to figure out how much?

One of the thought experiments Einstein proposed involved one twin staying on earth, while the second twin entered a shuttle. The twin in the shuttle went on a trip (a physical one), traveling near the speed of light. The twin in the shuttle would have time pass by slower than the one on the...

Homework Statement A rocket is launched to travel vertically upward with a constant velocity of say...20 m/s.After travelling maybe 35 s the rocket develops snag and its fuel supply is cut off. the rocket then travels like a free body, the height achieved by the rocket will be...

Homework Statement I need to find the initial velocity of a rocket using the method a=\Deltav/\Deltat. Given a situation where \Deltat = 4 seconds. The force of gravity in this case is -10(m/s) Homework Equations After I get \Deltav how do I turn that into the initial velocity? The...

A rocket is launched to travel vertically upward with a constant velocity of say...20 m/s.After travelling maybe 35 s the rocket develops snag and its fuel supply is cut off. the rocket then travels like a free body, the height achieved by the rocket will be THIS IS NOT A HOMEWORK QUESTION...

Continental pilot reports "missile or rocket" over Texas http://www.chron.com/disp/story.mpl/metropolitan/6453529.html

1) How fast must a rocket travel on a journey to and from a distant star so that the astronauts age 12.0 years while the Mission Control workers on Earth age 130 years ? c 2) As measured by Mission Control, how far away is the distant star? in light years my attempt 1) Time in...

Homework Statement A 1222 kg weather rocket accelerates upward at 8.7 m/s2. It explodes 2.16 s after liftoff and breaks into two fragments, one twice as massive as the other. Photos reveal that the lighter fragment traveled straight up and reached a maximum height of 612 m. What was the...

Homework Statement Find the gain in kinetic energy when a rocket emits a small amount of matter. (Well, there's more, but the rest of the question is built around this initial problem)... The Attempt at a Solution My logic revolves around the total kinetic energy of the rocket after...

Hi Can anyone help to write rocket equation with strap on booster. The exhaust velocity of the booster rocket and the core rocket is same? and The exhaust velocity of the booster rocket and the core rocket is different?

Lost please help! A 1974 kg weather rocket is launched straight up. The rocket motor provides a constant acceleration for 20.27 s, then the motor stops. The rocket altitude 23.94 s after launch is 7242. You can ignore any effects of air resistance. What was the rocket's acceleration during...

Homework Statement You are working on a project with NASA to launch a rocket to Mars, with the rocket blasting off from Earth when Earth and Mars are just aligned along a straight line from the sun. As a first step in doing the calculation, assume circular orbits for both planets. If Mars is...

Homework Statement A rocket is launched straight up with constant acceleration. Four seconds later a bolt flies off the rocket. The bolt hits the ground 6.0 seconds later. What is the acceleration of the rocket? Homework Equations acceleration = change in velocity/change in time...

Homework Statement A rocket is traveling with a speed 20 km/s in a non-gravity space. To fix the direction of motion, it turns on an engine, which pushes the gasses with constant speed 3 km/s w.r.t. the rocket perpendicularly to the direction of its motion. The engine is on till the mass of...

Is there some place with good information on saltpeter+sugar rocket propellant and it's making? The problem is, there are a lot of places on the internet telling how to do it right, but next to none on how to do it wrong, and I'm not brave enough to follow someone's instructions without...

Please help, book gives no examples relatively close to this. A rocket is fired in deep space, where gravity is negligible. If the rocket has an initial mass of 6000 kg and ejects gas at a relative velocity of magnitude 2000 m/s , how much gas must it eject in the first second to have...

I just read the following article on MSN News http://www.msnbc.msn.com/id/30028134/wid/11915773?GT1=31036 and I was wondering what kind of perchlorates? The only perchlorate rocket fuel I am famaliar with is ammonium perchlorate used in the solid fuel boosters on the Space Shuttle. That was...

Can someone please explain to me whether the potential energy of a rocket increases as it accelerates and moves further from Earth ? My immediate answer is yes, but if W=dKE, then all of the work is being converted into KE and not PE ?? Thanks very much

Although I'm sure i might change my mind, i want to become a rocket scientist. Though i have a few questions: 1.Where would be a preferable place to work 2.where would be a good place to live- nice house, good schools, and low crime rate 3.what will my salary look like If you know any answer...

Homework Statement You are working on a project with NASA to launch a rocket to Mars, with the rocket blasting off from Earth when Earth and Mars are just aligned along a straight line from the sun. As a first step in doing the calculation, assume circular orbits for both planets. If Mars...

Homework Statement A rocket operating with combustion chamber pressure and temperatures of 14MPa and 2500K respectively, has a throat diameter of 0.3m, and a nozzle area ratio of 50:1. Find the thrust and specific impulse developed by the motor with back pressures of 1 bar (10^5 Pa) and zero...

according to Newtons second law: \vec{F}=\frac{d\vec{p}}{dt}=m\frac{d\vec{v}}{dt}+\vec{v}\frac{dm}{dt}(1) ie force impelled on a body is equal to the rate of change of momentum however when we use calculus to derive rocket equation we get: m\frac{d\vec{v}}{dt}={\vec{v}_{gas\; relative \;to...

Homework Statement A rocket is fired in deep space, where gravity is negligible. In the first second it ejects 1/160 of its mass as exhaust gas and has an acceleration of 15.9 m/s2. What is the speed vgas of the exhaust gas relative to the rocket? Express your answer numerically in...

Homework Statement A rocket for use in deep space is to have the capability of boosting a total load (payload plus the rocket frame and engine) of 3.10 metric tons to a speed of 10 000 m/s. (a) It has an engine and fuel designed to produce an exhaust speed of 2000 m/s. How much fuel plus...

If my rocket has two rocket engines going off each at an impulse at 20.00 N/S... If my rocket has two rocket engines going off each at an impulse at 20.00 N/S, then would the total amount of impulse my rocket has be 40.00 N/S? Please answer seriosuly only this is extremely important and...

I want to calculate the exhaust velocity of a rocket. This is the formula that I found at http://en.wikipedia.org/wiki/Rocket_engine_nozzles which is: V_e = \sqrt{{\frac{T*R}{M}}*{\frac{2*k}{k-1}}*[1-(P_e/P)^(^k^-^2^)^/^k] } Ve = Exhaust velocity at nozzle exit, m/s T = absolute...

Hello, I need to figure out the force I require to lift the water rocket that I'm building. It weighs about three ounces or about .0850 kilograms to possibly make it easier. How much force will I need to provide lift-off. Would I take the acceleration due to gravity (9.8) times the weight of the...

Homework Statement I need to find out the rockets max velocity and max altitude. My teacher gave us an example but everytime i use the stuff we know his answer doesn't match mine. So we know: Rockets mass=23 grams mass of engine=16.2 grams mass of propellant=3.12 average thrust=8 Newtons burn...

A brief explanation, this assignment is to be done in Excel and also has to be turned in with handwritten solutions for finding total flight time and apex. If I can get the handwritten part done Excel is a piece of cake. Homework Statement A model rocket is launched and I am to evaluate the...

When looking at the design of the both the U.S. Saturn V rocket, and the Soviet N1 rocket, there is an obvious design difference between the basic overall rocket body shape. The Saturn V shows several conical regions, with a straight body design throughout. The N1 shows more of a...

Suppose the rocket is coming in for a vertical landing at the surface of the earth. The captain adjusts the engine thrust so that rocket slows down at the rate of 2.50m/s^2 . A 8.00-kg instrument is hanging by a vertical wire inside a space ship. 1]Draw a free-body diagram for the instrument...

Homework Statement A 200 kg weather rocket is loaded with 100 kg of fuel and fired straight up. It accelerates upward at 33 m/s^2 for 34 s, then runs out of fuel. Ignroe any air resistance effects. A) what is the rocket's maximum altitude? B) how long is the rocket in the air? Homework...

In deriving the rocket equation, there is one part I don't understand. The velocity of exhaust with respect to the body is assumed to be constant, where: v(exhaust wrt body)=v(exhaust wrt inertial)-v(body wrt inertial) So assuming a constant mass flow rate, the rocket propellant exerts a...

A rocket is accelerating upwards from rest in a uniform gravitational field g. Notation: m(t) is the mass of the rocket plus remaining fuel, m0 is the initial total mass, vex is the exhaust speed (relative to the rocket), and k is the rate, in kg/s, at which fuel is consumed. By considering...

Homework Statement A rocket, initially at rest on the ground, accelerates straight upward from rest with constant acceleration 53.9 . The acceleration period lasts for time 5.00 until the fuel is exhausted. After that, the rocket is in free fall. Find the maximum height reached by the...

Homework Statement During launches, rockets often discard unneeded parts. A certain rocket starts from rest on the launch pad and accelerates upward at a steady 3.20 m/s^2. When it is 260 m above the launch pad, it discards a used fuel canister by simply disconnecting it. Once it is...