Rocket Definition and 1000 Threads

Homework Statement I'm having trouble deriving the equation for the velocity of a rocket in constant G given that it has constant exhaust velocity Homework Equations I know that a=dv/dt=U/M(dM/dt)-g The Attempt at a Solution so from here dv=U/M dM-gdt v=U ∫1/M dM - g ∫dt v from 0...

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 6.0s later. Homework Equations v_x = v_0 + at x_f = x_0 + v_0t + 1/2at^2 v_x^2 = v_0^2 + 2a(Δx) The Attempt at a...

Homework Statement A "rocket car" is launched along a long straight track att = 0 s. It moves with constant acceleration a1 = 2.9m/s2 .At t = 2.8s , a second car is launched with constant acceleration a2 = 7.0m/s2 . At what time does the second car catch up with the first one? How far down the...

What do you guys think about the recent vote where the house of reps decided to ban (100-300 or so) imports of these Russian rocket engines? Seems like politicians and corporations looking to make a buck (like SpaceX) have succeeded in their lobbying for the ban on RD180 engine import. Is it OK...

I am stuck on how my teacher got to the last equation in #4. Problem Statement: A 2,000 kg rocket carrying 3000 kg of fuel is drifting in space when it fires its engine. While operating, the rocket engine burns 20 kg of fuel per second and the exhaust gasses leave the rocket at an exhaust...

Hello, I've always been interested in space and space flights and have often wondered how rockets are lunched into space, how their trajectories are defined, how they are sped up (like gravity assist), how they are slowed down (like the complicated trajectory of the Rosetta mission etc . . . I...

Hello, I am new here and I would like to know if anyone on here can answer a question for me. How far could a saturn V rocket (http://en.wikipedia.org/wiki/Saturn_V) push comet 67p off course if it were 100 million miles away? Also, how long would it take this rocket to stop the comet if it...

Homework Statement A rocket through interstellar dust, no gravity. Solve for v with respect to mass. k is a constant. Drag = -bv Homework Equations [/B] The Attempt at a Solution To start: It should become a separable differential equation, but I am having a lot of trouble solving it...

Carolynne Campbell, a rocket propulsion expert based in the Netherlands said that multiple warnings about the spacecraft s motor and fuel had been issued to Virgin since 2007. " I warned them that the rocket motor was potentially dangerous " Her warnings were related to the nitrous oxide and...

Okay, first of all, I'm not very good at maths, so I will have to talk in programmer terms here. I have the following issue: A small rocket is moving in space, and I want it to move to and stay at a location in space, similar to a quadcopter. No as far as I see it, I have the following variables...

Homework Statement How does change the total energy of the rocket during its motion inin a uniform gravitational field? 2. The attempt at a solution My idea is to write the law of conservation of energy systems - "rocket- gases" ##\frac{dE_{total}}{dt}=0## But get very cumbersome terms , the...

well. I have this question. That my rocket is launched from mar in an return mission to earth. To calculate specific impulse of the rocket. Should i consider mar or Earth gravity and if why!? Help me with this

Hi i am doing a project on the future of solar energy. While reading up on rockets and how they are propelled to escape velocity i noticed all references only tell us that the hot gases propel the rocket up. Could someone explain exactly how this happens. What i mean is does molecule collision...

I have noticed many of the thrust derivations in textbooks I have seen do not do a straightforward derivation of rocket thrust. The all seem to use the same trick with infinitesimals in a sort of binomial form. For reference: Taylor, "Classical Mechanics" Pg. 85. I am working on a rigorous...

Is anyone familiar with the so called rocket mass heaters - a popular DIY project? Has anyone ever studied design or uses?

Homework Statement A rocket is initially at rest on the ground. At time = 0, its engines ignite causing the rocket to move in a straight line with constant total acceleration of a = 30 m/s^2 at an angle of 76 degrees, and the engines are strong enough to counter gravity and keep it exactly in a...

Background This is for a video game, "Kerbal Space Program"... I'm sure some of you here have heard of it. It's the type of game you guys would be interested in. I have built a program to design rockets, but I'm not sure what the optimal thrust-to-weight ratio is. That is, how much fuel I...

Homework Statement A single-stage rocket is in deep space coasting at vrocket,i = 2.4 × 103 m/s. It fires its engine, which has an exhaust speed of vexhaust = 1.3 × 3 m/s. What is the rocket's speed vrocket,fafter it has lost one-third of its inertia by exhausting burned fuel? Assume that the...

Homework Statement A) A rocket fires two engines simultaneously. One produces a thrust of 675N directly forward while the other gives a thrust of 450N at an angle 20.4∘ above the forward direction. a) Find the magnitude of the resultant force which these engines exert on the rocket...

Homework Statement A rocket with a mass of 7.2 x 10^4 kg starts from rest in outer space and fires its thrusters until it is moving with a velocity of 100 m/s. What was the average force on the rocket due to the thrusters? Homework Equations 1/2 mv^2 = Fxd The Attempt at a...

... Continued from part 3. The Sands of Duna Part 4: We have ignition The author of this post (and story), collinsmark, is not affiliated with Squad nor Kerbal Space Program. We've waited long enough. So let's get this ship out the launch pad. Kerbals chosen for this mission are Melmon...

Which are more efficient, Rocket Engines or Jet engines, and why? It would make sense that rocket engines are more efficient because they aren't effected by air pressure but I have been told by some people that actually Jet engines are more efficient so I am confused. If you know of any link...

I’ve been thinking about Einstein’s gedankenexperiment (because I’m meta like that) regarding the sealed room on Earth, and the sealed room on a steadily accelerating rocket. And the result of this thought process is… I’m confused, probably because I do not correctly understand the parameters...

Homework Statement A rocket is moving in a gravity free space with a constant acceleration of 2 m/s2 along + x direction (see figure). The length of a chamber inside the rocket is 4 m. A ball is thrown from the left end of the chamber in + x direction with a speed of 0.3 m/s relative to the...

The Little Rocket That Could [Figure 1. Check this out.] This post illustrates an example of KSP rocket design. The following are the rocket's design goals: Get three kerbals and a bunch of science items to the Mun, in an Apollo style mission: such that two kerbals (and science) land on the...

The concept of a problem is that if rockets continue to jettison fuel, at some point they will get a very small momentum because their mas will be so small. (Bit of a silly problem, there's a lot of mass in the rocket itself) Anyways, the idea is that you would take the derivative of the...

Having some trouble with this problem. I'm not sure if the first part is correct, I just need some feedback on that. Also I'm not sure how to calculate velocity or altitude after 1 second. Any help would be awesome! Homework Statement A rocket has an initial mass of 4000kg, of which 3000kg is...

Homework Statement A rocket is launched such that when the fuel is exhausted, the rocket is moving with a speed of Vo at an angle of 37° with the horizontal and at an altitude h. (a) Use energy methods to find the speed of the rocket when its altitude is h/2. (b) Find the x and y components of...

In AP Physics B, for our physics olympics, for one event, we are required to make a paper rocket that will be launched straight up in the air by an air compressor and pump. (60 psi) We have already assembled the paper rocket, with one cylinder of paper, a cone paper nose, and a load of tape to...

I have a question regarding the design of rocket nozzles. I am not an engineer nor a physicist but I am involved in amateur experimental rocketry and I was curious regarding grossly overexpanded nozzles. According to Wikipedia a grossly overexpanded rocket nozzle (very bottom of the...

Homework Statement Consider a rocket making a vertical ascent in a uniform gravitational field, g. Show that the height of the rocket when the fuel is exhausted is given by x = ut_b - \frac{1}{2}g{t_b}^2-\frac{um_R}{α}ln{\frac{m_R+m_F}{m_R}} where "u" is the exhaust velocity of the fuel...

i was wondering why not use the air in the surrounding to oxidise the fuel in the first stage of a rocket? it definitely will burn with the fuel(assuming bi propellant ) and will also reduce the wet mass of the rocket? is there any problem with this ?

Given an ideal rocket in a friction-free, gravity-free environment: A precise amount of energy E is applied to accelerating a rocket. An external observer at the origin (rocket velocity=0) watches the rocket accelerate to a final velocity V. As expected, the origin observer finds that V...

Homework Statement Interstellar Spaceship An interstellar spaceship with initial mass Mo is at rest at the edge of a small, spherical nebula (gas cloud). At t= 0, the engines begin to fire, ejecting gas out the back at constant speed u relative to the rocket. The mass of the rocket decreases...

Hello Firstly i just registered, I am a final year computer science student and I am busy working on my thesis (the deadline is fast approaching) I am working this application of a rocket going into orbit and physics is not my forte. I need some help on converting the gimbal of a rocket...

Hi all! I have entered a a water rocket competition. The rockets in this competition will be launched at 60 psi. We have to launch the rockets horizontally and to hit a round landing site 100 meters(approximately 328.084 ft) away and 30 meters (approximately 98.4252 ft) wide. I am not good at...

Homework Statement A rocket of length ##L_o## flies with constant velocity ##v## (in frame S' relative to a frame S in the x direction). At time t=t'=0, the capsule on the top of the rocket passes the point ##P_o## in S. At this moment, a light signal is sent from the top of the rocket to the...

I'm trying to calculate the thrust produced by a steam rocket, but I don't have that much information to work with (or at least information I don't know what to do with). It's 2m long and has a diameter of 1m, and it's constantly filled with water at a rate of 170.344L/sec, which is...

Homework Statement a rocket explodes in flight into two equal mass pieces still going in the same direction with one piece moving twice as fast as the other. What is the ratio of the total kinetic energy of the pieces just after the explosion to that of the rocket just before? Homework...

Homework Statement A model rocket is launched with an initial velocity of 55 m/s. Its height as a function of time can be modeled by h(t) = -4.9t2 + 55t. Determine the maximum height reached by the rocket.Homework Equations h(t) = -4.9t2 + 55tThe Attempt at a Solution h'(0) = 55, since h'(t) =...

My first post, and a very long one... I have problems understanding the prolific use of a certain term in the rocket thrust equation and its validity. The general rocket thrust equation contains a term referred to as the pressure thrust. It is calculated as (p_e – p_a)Ae where p_e is the...

Hey everyone, so I'm just wondering if you guys can articulate the term "velocity of lost mass" from the rocket. After a few massaging on the equations(derivatives and integrals stuff) i found that to manipulate the thrust, one must manipulate the burn rate AND the "velocity of loss mass". all i...

A test rocket is launched, starting on the ground, from rest, by accelerating it along an incline with constant acceleration a. The incline has length L, and it rises at θ degrees above the horizontal. At the instant the rocket leaves the incline, its engines turn off and it is subject only...

Homework StatementA rocket is accelerated for 10 years at a constant rate of 10 m/s². Then starts braking at -10 m/s². Then goes all the way back to its starting point by again first accelerating 10 years at 10m/s² and then braking at the opposite rate for 10 years. How much time has it been for...

Homework Statement I am trying to model a water rockets motion using a computer programme in order to compare it to my experimental data. I am studying physics at degree level but I have no knowledge of programming and am finding this particularly difficult. I have thought about using...

hello guys could anybody tell me the method of finding the range of a rocket launched from height h, the rocket of course is under three forces weight,drag and thrust

This is a LED lighting project that will go into a high power rocket shaped like saucer. Because this is a high power rocket, it must be launched at a certain distance from spectators for safety reasons. The launch pad will be at least 200-300 feet from spectators and rocket may go as far as...

For exact example, the Apollo rocket, that carried Armstrong to the Moon? Yes i read atomic rockets, but that happened : http://en.wikipedia.org/wiki/Chelyabinsk_meteor It looks like to me, they were a bit over optimistic about how far can we detect a simple heat radiating object. Ok that...

Hi I have written a set of equations for rocket flight (below) as i need to know the final altitude at various configurations (fuel mass/payload/exhaust mass flow/thrust). I would ask if someone can please verify if this is correct (i have compared the results to results gained from...

Here is the question: I have posted a link there to this thread so the OP can view my work.