Rocket Definition and 1000 Threads

I've been posing this question to physicist folk for 10 years, mySpace 6 years ago, and here (don't know when, when I had an older account), and I see that others bring it up on occasion. I will refine it to meet current objections. You have a photonic drive spaceship. It has a (classical) mass...

I'm hoping that someone can guide me toward some literature on 'rocket science'. I know that is not very descriptive, but essentially, I would like to learn about the engineering and physics principles that govern rocket flight (to include propulsion and guidance). I have found some books...

Homework Statement A rocket of initial mass of 2.85x10^6 kg is on the surface of the earth. if the initial acceleration is .20g, what is the required thrust? if the fuel is burned at a rate of 14,500 kg/s, with what speed is it ejected from the rocket? Homework Equations The...

In the Tsiolkovsky rocket equation derivation there is a part that says: \frac{dV}{dt} = -\upsilon_e \frac{1}{m} \frac{dm}{dt} "Assuming v_e, is constant, this may be integrated to yield:" \Delta V\ = v_e \ln \frac {m_0} {m_1} How does this work? The differential is an operator...

Homework Statement A rocket, initially at rest on the ground, accelerates straight upward from rest with constant acceleration 34.3 m/s^2. The acceleration period lasts for time 10.0 s until the fuel is exhausted. After that, the rocket is in free fall. Find the maximum height y_max...

Can someone provide me to a guide, book or some kind of tutorial that would help me in learning how to simulate the flow of gases in a rocket nozzle? I am trying to investigate the effect of my expansion ratios, nozzle geometry and other design parameters and simulate it. I would be very...

Me and a few friends are having a contest to see who can create a rocket that has the longest hangtime when shot out by air pressure built up in a container. I thought about doing a parachute, but that's risky considering that it could slow down the rocket when it is ascending and it might not...

Homework Statement This is not exactly a homework question. Special relativity question. See attach. 1. Two spaceships are passing each other, having their fronts marked F and F'. When F' sees the other's rear passing the front of F', F' fires a rocket. Clearly it misses, since the F SS is...

Rocket design --300km range, 5-15kg payload, 200mg accuracy Hi, I'm working on a project for a mech engineering class where we have to design a remote control vehicle to carry a small payload 300km. It must be able to survive rain, crosswind speeds up to 70km/h, temperatures up to 50 degree...

The Problem: A 4.60 kg rocket is launched directly upward from Earth at 9.00 km/s What altitude above the Earth's surface does the rocket reach? Relevant Equations: v = √ (2GM/r) The Attempt: m = 4.60 kg v = 9km/s = 9000m/s G = 6.67 x 10^-11 9000^2 = 2(6.67^-11)(4.60)/r...

Homework Statement In a two-stage rocket, the exhaust velocity for the first stage burn is 3000 m/s and for the second stage burn is 3000 m/s. Assume that during the entire sequence of burns the rocket is still near enough to the surface of the Earth to approximate the external gravitational...

A rocket of mass m=1.20x10^3 kg is launched vertically upward from the Earth's surface with an initial speed v0 = 7.00 km/s. Calculate the maximum height H of point A above the Earth's surface at which the rocket will momentarily come to rest, before it starts falling back on the earth. So I...

Homework Statement Two powerless rockets are on a collision course. The rockets are moving with speed v = 0.800c (rocket 1) and v = -.600c (rocket 2) and are initially 2.52 * 10^12m apart as measured by Liz, an Earth observer. Both rockets are 50m long as measured by Liz. a) What are their...

I did a bottle rocket yesterday (2 liter bottle). I made 4 fins and the end of the fins touch the ground instead of the bottle's opening. I also equip my rocket with a parachute (hide under the nose cone). In addition, I added a modeling clay to my nosecone too! When I tested it, my teacher said...

Homework Statement Say I've got a rocket payload (there's no thrust, it's just dead weight) falling to Earth from an altitude of 260km and I want to calculate the time it takes it to fall to 160km. It's far enough away from Earth that I can't make the assumption that gravity is constant (it...

Homework Statement An engine supplies an upward force of 9.00N to an initially stationary toy rocket, of mass 54.0g, for a distance of 25.0m. The rocket rises to a height of 339 meters before falling back to the ground. What was the magnitude of the average force of air resistance on the...

Could a "pure-electric" laser-propelled space rocket be mere decades away? I know that there probably isn't a battery capable of making this practical yet, but if it were possible to store energy at a high enough density, wouldn't that make it theoretically possible to make a rocket that uses...

Homework Statement A physics student launches a model rocket from the ground at t=0. The rocket ascends with a constant vertical acceleration of a1= 2.5m/s^2 until T1= 5.0s, when the acceleration increases to a2= 5.0m/s^2 until T2= 10.0s. When t>T2, the engine shuts down entirely. (b) What is...

Homework Statement A 10.2 kg weather rocket generates a thrust of 177.0 N. The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is 385.0 N/m, is anchored to the ground. Initially, before the engine is ignited, the rocket sits...

I'm trying to solve a rocket problem and have found no clear answer on how to do this. If I have a rocket in space (no significant gravitational forces, no drag, etc.) with a known constant thrust (T), mass flow rate (mdot), exhaust velocity (Ve), total initial mass including propellant (Mi)...

Hello, I'm trying to solve the rocket equation in a nonuniform gravitational field. The standard rocket equation at a distance x from the center of a planet of mass M gives: m*d^2x/dt^2 + v_e*dm/dt = -GmM/x^2 where v_e is the relative exhaust velocity. Multiplying by dx/dt and assuming...

Homework Statement A rocket at rest in space, where there is virtually no gravitational force, has a mass of 2.55 * 105 kg, of which 1.81*105 kg is fuel.The engine consumes fuel at the rate of 480 kg/s and the xhaust speed is 3.27 m/s. The engine is fired for 250 s. Find the thrust of the...

Homework Statement A rocket for use in deep space is to have the capability of boosting a pay load ( plus the rocket frame and engine) of 3 metric tonnes to an achieved speed of 10000m/s with an engine and fuel designed to produce an exhaust velocity of 2000m/s. a) How much fuel and...

Homework Statement Suppose that the acceleration of a model rocket is proportional to the difference between 100 ft/sec and the rocket's velocity. If it is initially at rest and its initial acceleration is 50 ft/sec2, how long will it take to accelerate to 80 ft/s? The Attempt at a...

I'm looking for a small camera to use in my rocket. It's about a 7' rocket, 4" diameter and 3" long viewing window. I've heard that the choices are either cmos or ccd but I don't know the difference between the two. I'm only looking to spend up to $100 (really looking in the $50 range). Any...

Hi all! I've just finished writing a program in python that determines the position of a rocket in the Earth moon system. Initially it is in circular orbit around the Earth and then it is given a velocity boost at some point in it's orbit to make it travel to the moon. I started all 3 bodies...

Homework Statement A spacecraft begins a journey with rest mass Mi. Its method of propulsion involves converting matter entirely to photons, which are emitted in the direction opposite to the direction of motion. After a period of acceleration the rest mass has been reduced to Mf. Show...

Homework Statement Suppose that during the launch of a rocket from the surface of the earth, an astronaut onboard the rocket stands on a bathroom scale and measures her weight to be 3.6 times her normal weight. Determine the acceleration of the rocket. Homework Equations Fnet \sumF = ma or...

Homework Statement rockwt has reliability of 0.81 for the first trail. if the manned rocket fails there is probability of 0.05 of a catastrophic explosion in which case the abort system can not be used. id the abort can be attempted the system has a reliability of 0.90 find 1- the...

"A rule of thumb is that for every ten-percent increase in efficiency for rocket fuel, the payload of the rocket can double.” Can someone assist me with a simple formula to model this rule-of-thumb? What happens to the payload if the rocket fuel efficiency increases twenty to thirty percent?

Homework Statement Hello, I am currently a gr 12 high school student, and I am stuck in a problem. Please help :) The problem: Consider the motion of a rocket near the surface of the Earth. In this case, mass, in the form of gas is expelled from the rocket to propel the rocket upwards. A...

A 20 000kg rocket exhausts gases at a constant 600kg per second at 300ms^-1 a) Calculate the momentum of the exhaust gases b) Deduce the thrust applied to the rocket engines Any help would be much appreciated

Normally, one would think that an object generating large amounts of thrust would fly all over the place with no clear direction. How does a rocket stabilize and launch perfectly straight up?

Homework Statement A rocket is launched at an angle of 58.0° above the horizontal with an initial speed of 98 m/s. It moves for 3.00 s along its initial line of motion with an acceleration of 28.0 m/s2. At this time its engines fail and the rocket proceeds to move as a free body. Maximum...

So I'm looking and researching to build a small liquid-fueled rocket engine. So far I think my choice for fuel is definitely unleaded gasoline because of it's high impulse when mixed with Gas-state O2 and how easy it is to obtain. Previously, I was looking at using Hydrogen Peroxide (H202) for...

Homework Statement My rocket was angled at 79 degrees from the vertical, I calculated its maximum vertical height to be 60 meters, The total flight time was 7 seconds Experimental horiz distance is 40 yds (should be 36.6 meters) Homework Equations This is part of my problem, I am...

A rocket accelerates from 1,000ms-1 at a rate of 20ms-2 for 2 minutes. (a) What speed did it reach?

Homework Statement 15. (4) A rocket is launched vertically from Earth's surface with a velocity of 3.4 km/s. How high does it go from Earth's centre? Homework Equations Ek = 1/2mv^2 Eg = -GMm/r The Attempt at a Solution 1/2mv^2 = -GMm/r 1/2(3400)^2 =...

Here is the problem: In free space, what would the answer to number 2 be? Number 2 is a=((Vrk)/(1-kt))-g. I think that since there is no gravity in free space the answer is a=((Vrk)/(1-kt)). Is this correct and is my reason for it correct?

Here is what I know a = (-Vr/m)(dm/dt)-g, I also know that 6. : m=m(initial)(1-kt). Under the conditions of 6: Show that a = ((Vr)(k))/(1-(kt))-g. I have tried to solve this problem by substituting dm/dt=-km(initial) into the first equation I have listed (a = etc.) but I have had no luck. Please...

Suppose the rate of ejection mass by a rocket is a constant, dm/dt = -kmo. I need to show that m=mo(1-kt). I know -mg=m(dv/dt)-Vr(dm/dt). I thought that I could just substitute for (dm/dt) and get the solution but I am having no luck. Please help me show this property.

First off this is not homework or coursework, just general interest. I've been looking to derive the rocket equation which includes the effects of Universal Gravitation. I've been able to derive it assuming near Earth gravity where g is taking as constant acceleration...

Homework Statement Calculate the maximum height and the initial speed of the rocket. Show The equaltions and then show your substitutions. The total flight time was 6.52 seconds. the height time will be expressed in meters and feet and the velocity will be expressed at m/s, feet/second...

Homework Statement A rocket of mass 4.70E+5 kg is in flight. Its thrust is directed at an angle of 50.8° above the horizontal and has a magnitude of 7.39E+6 N. Calculate the magnitude (enter first) and direction of the rocket's acceleration. Give the direction as an angle above the...

I'm currently developing a game using a pre-existing physics library called Box2D and I've stumbled into some unexpected behavior that I can't pinpoint being actual physics or an artifact of the programming. My spaceship is traveling through a 2D vacuum facing straight along it's velocity...

At what horizontal velocity would a satellite have to be launched from the top of Mt. Everest to be placed in a circular orbit around the earth? The book earlier in the chapter provides two things relating to Mt. Everest: 1. g at the top of Mt. Everest is 9.77 m/s2 2. The top of Mt. Everest...

Homework Statement A polaris missile has a mass of 1.4 x 10^4 kg and its engine has a thrust of 2 x 10^5 N. If its engines fire in the vertical direction for 1 min starting from rest, to what vertical height would it rise in the absence of air resistance? Homework Equations F=ma W=mg...

If a rocket doubles it's relative exhaust velocity while do tripling the "burn rate" of fuel, the thrust... A) doubles B) Triples C) increases 5 times D) increases 6 times E) none of the above! Thrust=dv/dt=lVe(dM/dt)l I just plugged in 2 for V and 3 for dM and 1 for dt giving me 6

Homework Statement In class we made rockets out of 2L bottles and launched them using pressurized water. The angle that ours went at was 50 degress. Height was 26m. Hangtime 5.18s acceleration 3.8m/s2 and the mass of the rocket was .52kg Homework Equations I am trying to find the...

1. A solid bar of length L = 0.5m and with W = 0.1m weighs 2kg. It also has two constant-thrust rockets attached on either end. Each rocket is small enough to be considered a point mass of 0.25kg. If the bar is initially at rest and in two seconds after the rockets are fired it achieves a...