Rocket Definition and 1000 Threads

Hello folks! I was just watching a YouTube clip of the American MLRS system being used during Operation Desert Storm in 1991. I'm afraid I can't post a direct link to the video because of the 15 posts requirement, but if one does a search for "MLRS" it is the first video in the results...

escape velocity is defined in resnick,halliday,walker as 'the certain minimum initial speed that will cause it to move upward forever, theoretically coming to rest only at infinity. This initial speed is called the escape speed.' the way escape speed is defined here gives me the impression...

My physics class is ending the year with the study of rockets. He said it will be one of the most difficult studys of physics because the mass of the rocket doesn't stay constant. What do you think? Any hints/tips you would like to share? Thank you.

hello, does anyone know how to derive the ROCKET ENGINE THRUST formula: T = P/R AV + (P-B)A i know you need to use F=ma and Momentum flow rate equations to get the first place. but what do you do after that? Any help would be greatly appreciated. Thanks, Michael

The weight of a rocket is 80kN at the instant it takes off , and the products of the combusion are ejected at a velocity of 0.60 kms-1 relative to the rocket. Calculate the rate at which the rocket must be consuming fuel in order to take off vertically. Ans: 134kgs-1 Cant find a solution...

I was to design my own rocket and build it eventually. I am a Computer engineering student and want to go for the other side of engineering. I want to learn all the math and everything. So how an I go about this? Is there some good books? just a general introduction would be great.

Homework Statement A rocket is launched straight up from the Earth's surface at a speed of 15,000 m/s. What is its speed when it is very far away from earth? Homework Equations K=.5mv^2 U=-GMm/R The Attempt at a Solution Is this correct: I used conservation of energy and assumed...

Homework Statement I've done the first part, I'm just posting it for completeness A rocket at rest in deep space has a body of mass m and carries an initial mass M of fuel, which is ejected at non-relativistic speed v0 relative to the rocket. Show that the speed of the rocket vf after...

I am sure this question in some form gets posted here all the time again and again, but I somehow can not find it in the form I would recognize, so my appologies for probably posting it again. So one of the classics: Two light beams - A and B get launched from Earth to the opposite directions...

Please help me . (1)- A gun is fired vertically into a 1.4 kg block of wood at rest directly above it. If the bullet has a mass of 21 g and a speed of 310 m/s, how high will the block rise into the air after the bullet becomes imbeded in it ? (2)- A rocket of total mass 3700 kg is...

Homework Statement A rocket with a mass M moves along an x-axis at the constant speed vi=40 m/s. A small explosion separates the rocket into a rear section (of mass m1) and a front section; both sections move along the x axis. The relative speed between the rear and front sections is 20...

Hi All, I'm a junior in HS. I have a research project due this semester for Physics B (first year introductory college physics). Last semester I did some research on boundary layers, friction loss in pipes. This semester I've decided to do some investigation on air breathing rocket...

Homework Statement A rocket is accelerating upward at 4.00 m/s^2 from the launchpad on the earth. Inside a small 1.50-kg ball hangs from the ceiling by a light 1.10-m wire. If the ball is displaced 8.50 degrees from the vertical and released, find the amplitude and period of the resulting...

Homework Statement A small rocket to gather weather data is launched straight up. Several seconds into the flight, its velocity is 120 m/s and it is accelerating at 18 m/s^2. At this instant, the rocket's mass is 48 kg and it is losing mass at the rate of .5 kg/s as it burns fuel. What is...

Hey.. I am not too sure where this thread would go. Please remove it if needed. What are the requirements needed to major in Rocket Science? What Universities offer that major? What are the foundations that are tough to the students meaning what they learn? Is it more of a challenge then pure...

Homework Statement If the rocket has an initial mass of 6000kg and ejects gas at a relative velocity of magnitude 2000m/s , how much gas must it eject in the first second to have an initial acceleration of 25.0m/s^2 Homework Equations v=v_exln(m_0/m) The Attempt at a Solution i...

Homework Statement A 11.7 kg weather rocket generates a thrust of 240 N. The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is 560 N/m, is anchored to the ground. (a) Initially, before the engine is ignited, the rocket...

i heard about that when we lauch a rocket, the astronaut must endure acceleration which can be many times of g. why can't we accelerat it unceasingly for longer time and more slow down the burning of fuel.

[SOLVED] Momentum. resulting velocity. Rocket Homework Statement On earth, an astronaut and equipment weigh 1,960.0 N. While weightless in space, the astronaut fires a 100 N rocket backpack for 2.0 s. What is the resulting velocity of the astronaut and equipment? I have to be...

[SOLVED] 200kg Astronaut, 2.0 m/s, 100.0 N rocket ? A 200.0 kg astronaut and equipment move with a velocity of 2.00 m/s toward an orbiting spacecraft . How long will the astronaut need to fire a 100.0 N rocket backpack to stop the motion relative to the spacecraft ? Give your answer in s...

Homework Statement A model rocket is launched vertically upward. If it's position (height) y above the ground in feet as a function of time t in seconds is given by: Homework Equations y = f(t) = 192t - 16t^2 The Attempt at a Solution 1. Find the instantaneous velocity and...

Homework Statement A 1200 kg rocket car is placed at the bottom of a 100 metre long ramp inclined at 10 degrees. The rocket is turned on and it exerts a force of 8300 N for 5.7 seconds, and then it shuts down. Find the speed with which the rocket car leaves the ramp (assume frictionless)...

I was hoping someone could help me with this homework problem that has me stumped. Any assistance would be appreciated. Suppose the first stage of a two-stage rocket has total mass 1.30×10^4 kg, of which 1.10×10^4 kg is fuel. The total mass of the second stage is 1000 kg, of which 700 kg...

[SOLVED] Distance a rocket travels on a launch ramp Homework Statement A 1600kg rocket is to be launched with an initial upward speed of 51.0m/s . In order to assist its engines, the engineers will start it from rest on a ramp that rises 53 degrees above the horizontal. At the bottom...

Imagine we have two rockets, each with a long cylinder with it spin axis alligned with the long axis of the rocket. On one rocket the cylinder is spun up to a high speed. Both rockets have an equal load of fuel. If both rockets are launched from the same spot simultaneously in the same direction...

A rocket moves through outer space at 11,000 m/s. At this rate, how much time would be required to travel the distance from Earth to the Moon, which is 380,000 km? A rock thrown straight up climbs for 2.50 s, then falls to the ground. Neglecting air resistance, with what velocity did the...

[SOLVED] The Angle of the Launch of a Rocket against a Strong Wind Homework Statement A 1210-kg rocket is launched with an initial velocity v = 85 m/s against a strong wind. The wind exerts a constant horizontal force F= 8650 N on the rocket. At what launch angle will the rocket achieve its...

Homework Statement Two mass m1 and m2, connected by a massless spring of force constant k, are at rest in equilibrium on a smooth horizontal table. A velocity of magnitude v and direction away from m2 is imparted to m1. a.) Find the speed of the center of mass. b.) Determine the speed of m2...

This free fall problem seems simple, but I can't get it. you have a rocket fired from rest with an acceleration of 40 m/s^2. It runs for 2.5 and then falls. I'm wanting to find the maximum height, which I think would require me getting the initial velocity first. v = v0 + at 0 = v0 + 40(2.5)...

[SOLVED] Rocket Height (Motion in streight line) Hey I'm 75% sure i have the correct answer, but i have to turn it in tomorrow and it's a lot of points so i just want to make sure I'm going it right. Homework Statement A rocket, initially at rest on the ground, accelerates straight upward...

[SOLVED] Rocket Acceleration? Homework Statement A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 6 seconds later. What was the rocket's acceleration? Homework Equations Vf=Vi +...

Here's the paper I'm talking about http://arxiv.org/PS_cache/gr-qc/pdf/9702/9702005v1.pdf It's times like this I wish I'd gone to class... I've been trying to find a method of propulsion that falls within the realms of accepted physics but is convenient in terms of *storytelling*. I...

Ok, so if there is a better place for this, please do move it mods, I just couldn't find a place to post project related stuff so I chose this part of the site. Anyways, I'm working on a homemade liquid rocket engine all based around a CO2 cartridge combustion chamber. This project also has the...

I was looking on wiki about different froms of propulsion and I have this very general question. When a rocket produces thrust from its exhaust, what exactly is it 'pushing on' ? I mean on Earth, when a jet plane uses its engines to take off, what is going on...is the exhaust 'pushing' on...

is this equation true Fnet=[m(Vf-Vi)]/Delta T net force is equal to the mass times the change in velocity all over time thanks alot

Homework Statement A rocket is fired vertically, ejecting sufficient mass to move upward at a constant acceleration of 2.86g. After 50.2s, the rocket motors are turned off, and the rocket subsequently moves under the action of gravity alone, with negligible air resistance. Ignoring the...

Homework Statement u ---> gas speed (relative to the rocket) v ---> rocket speed (relative to the stars) v - u ---> speed of gas relative to the stars v - v_0 = u ln \frac{M_0}{M} Where M0 is the initial mass of the rocket, and M is the final mass. Part a) If a rocket...

Hi all, I'm afraid this may sound rather trivial but a friend of mine brought up this topic and we're quite confused about it: how does a rocket change its velocity in space? My understanding is that the rocket releases gas, and this gas will cause the rocket to accelerate. If you take...

Homework Statement Hi Guys, First post, so please take it easy on the noob The problem is designing a MATLAB program for a rocket that has the user enter the following; 1) Launch angle 2) Launch velocity (ft. per sec) 3) Distance to target 4) How high the target location is above...

hi guys!~ i was going through my test papers and found a question that i don't understand >_< when a rocket is shot upwards and at the point where it stops in the air, it explodes... so why does its momentum remain unchanged but the kinetic energy is increased?? ~by the way, the answer...

This tutorial provides an elementary development of the key concepts that describe the behavior of rocket propulsion systems. The following concepts will be discussed in this tutorial Characteristics of a rocket engine This post characterizes a rocket engine. Equations of motion The next...

Homework Statement How high does a rocket have to go above Earth's surfae before its weight is half what it would be on earth Homework Equations F=GMeMr/r^2, however there are too many variables here to use The Attempt at a Solution F/2=GMeMr/((sq root 2)r))^2, but I don;t know...

Homework Statement A rocket is 1/2 miles in the air going 40mi/h a bystander is standing 1 mile away from where the rocket took off straight up. What is the rate of change of the angle that the bystander makes with the rocket. Homework Equations The Attempt at a Solution I set...

A toy rocket, of mass 90g, acheives a velocity of 80m/s after 3.0s when fired straight up. What average thrust force does the rocket engine exert? I dont' know what formula to use for this

A rocket can't travel faster than the speed of light. What would happen if you sent off a rocket going at 0.5c in one direction, and then sent off another rocket going at 0.5c in the opposite direction? Wouldn't one be traveling at the speed of light, relative to the other?

I am building a model rocket for a school project, and I am using a PITSCO model rocket kit. We are not to be altering the engine in any way. What can I do to get the highest possible altitude and maximum time duration? (from launch till touchdown) As far as I know, the best thing we can do...

My sister has a high school competition to make a miniature rocket that shoots up - where the highest reaching rocket wins. The best Idea I can think of is using * a two liter pepsi/coke bottle and have a system to drop a whole roll of mentos into it * hopefully without tearing the...

Homework Statement The space shuttle, with an initial mass M = 2.41E+6 kg, is launched from the surface of the Earth with an initial net acceleration a = 26.1 m/s2. The rate of fuel consumption is R = 6.90E+3 kg/s. The shuttle reaches outer space with a velocity of vo = 4632 m/s, and a mass of...

For this question: http://tinyurl.com/ynkshx I just use ma=(3000-800)*20 =44kN to get the answer, and the answer is correct. and haven't make use of thrust=exhause velocity * dm/dt or change in velocity=exhause velocity*ln|initial mass/final mass| So, just want to confirm am I solved...

Lets say Mt. Everest was located on the equator. How much more efficient would it be to launch a rocket from the top of this mountain as compared to a sea-level Florida launch? There would be much less atmosperic drag since you would be starting out 5-miles high. You would be slightly closer to...