Rocket Definition and 1000 Threads

We are having a debate here at work and we need an answer from some smart folks (that's you). If you have a rocket ship in space that takes 1 gallon of gas to reach 1000 mph then, negating friction, would it take less, more or the same amount to go from 1000 mph to 2000 mph. Thanks, Sub.

Rocket propulsion In the serway textbook at the rocket propulsion section it is mentioned that If the fuel is ejected with a speed v_e relative to the rocket (the subscript e stands for exhaust, and v_e is usually called the exhaust speed), the velocity of the fuel relative to the Earth is...

A fireworks rocket is launched vertically upward at 40 m/s. At the peak of its trajectory, it explodes into two equal-mass fragments. One reaches the ground t1= 2.51s after the explosion. When does the second reach the ground? t= ...?? logiclly, it is 2.51 s also ...but I don't know. so...

A fireworks rocket is fired vertically upward. At its maximum height of 75.0m , it explodes and breaks into two pieces, one with mass = 1.25kg and the other with mass = 0.240kg . In the explosion, 910 J of chemical energy is converted to kinetic energy of the two fragments. a) What is the...

Alright what i am trying to do is to find the proper ratio of water in a water bottle. The Bottles are 591 ml and 2 L I am trying to figure out the equation to get the maximum height of the rocket. Does anyone know how i can get this equation ? i haven't factored the...

A rocket is rising vertically from a point on the ground 100 meters from an observer at ground level. The observer notes that the angle of elevation is increasing at a rate of 12 degrees per second when the angle of elevation is 60 degrees. Find the speed of the rocket at that instant.

Homework Statement "During the launch, a rocket is accelerated with 20.0m/s^2 upward. A 105.0kg astronaut is more concerned about his weight than about his safety and is standing on a scale. What is the scale reading in kg?" Homework Equations F=ma and also 4.45N=1lb The Attempt...

Hi. This one has been bugging me for a while. We briefly covered this in lectures getting just the main points with no derivations and I would like to fully understand this. I have a couple of questions and any help would be greatly appreciated. Homework Statement The main jist is this: A...

Homework Statement An 8.0Kg rocket is fired and encounters a force of air resistance of 4.9N. If the rocket's engines applied 100N of thrust: A. What is the Net Force on the rocket? B. What is the Rocket's Acceleration? Homework Equations (A) F=MA (B) Is it (Vfinal - Vinitial)/T? The...

Urgent ...please Help! I have to make test corrections in my physics class and i leftmy book at school and i don't know how to do 5 problems and my grade is basically dependig on this...ill gie one of them and if anyone can help thatd be great! thanks! a model rocket flies horizontally off...

Homework Statement Far in space, where gravity is negligible, a 495 kg rocket traveling at 85.0 m/s fires its engines. The impulse imparted to the rocket is 15000Ns, for 30 seconds. What is the maximum velocity of the rocket? Homework Equations F(delta t)=mv2-mv1 The Attempt at a...

I have this equation: dP = P(t+dt) - P(t) = mdv +dmv(ex) (ex=external) I have to show that that will equal ma = -ma + F(ex) (Although in the book, acceleration is shown as the derivative of v, (dotted v)). In the example I was reading, there are no external forces, so my first...

how high does a rocket have to go above the Earth's surface until its weight is 0.4 times its weight on the Earth's surface ? The radius of the Earth is 6.37 * 10 ^ 6m and the acceleration of gravity is 9.8 m/s^2. Answer in units of km. what i got so far, i need help proceeding: Applying...

Homework Statement A rocket moves upward, starting from rest with an acceleration of 31.0 m/s2 for 5.00 s. It runs out of fuel at the end of the 5.00 s but does not stop. How high does it rise above the ground? Homework Equations x=1/2at^2 The Attempt at a Solution...

Homework Statement (Q) A rocket is initially at rest on the ground. When its engines fire, the rocket flies off in a straight line at an angle 53.1 degrees above the horizontal with a constant acceleration of magnitude g. The engines stop at a time T after launch, after which the rocket is in...

How does a rocket get tested in a wind tunnel? what is it's orientation? an airplane is facing the air, like in reality, as it flies. so does that mean you mount a rocket vertically, but have the wind come on the side? or do you mount it pointing in the direction of the wind? and does...

Homework Statement "The acceleration of a certain rocket is given by a=Ct, where C is a constant. (a) Find the general position function x(t). (B) Find the position and velocity at t=5 s if x= 0 and v= 0 at t=0 and C= 3 m/s^3" so a= Ct t=5s x=0 v=0 t=0 C= 3...

Rocket Force -- Max Range vs. Time Homework Statement "Assume an ICBM of maximum range 8000 km is fired at your city from a distance of 8000 km." 1) How much warning time will you have if the missile is first detected at its halfway point 2) How fast will the missile be traveling when...

Homework Statement A rocket on its launch pad has a mass of 20,000kg. The engine fires at t=0s and produces a constant force of 500,000 N straight up. The engines fire for 1 minute during which the entire 10,000kg of fuel on poard is consumed and expelled from the rocket at a constant rate...

Homework Statement A rocket moves upward, starting from rest with an acceleration of 29.0 m/s^2 for 8.00 s. It runs out of fuel at the end of the 8.00 s but does not stop. How high does it rise above the ground? (in meters) Homework Equations deltaX=(1/2)final velocity * change in...

I need an egg protector to go in a bottle rocket that is not metal, styrofoam, packing peanuts, or bubble wrap.

Homework Statement In the first stage of a two stage rocket, the rocket is fired fro, the launch pad starting from rest but with a constant acceleration of 3.50 m/s^2 upward. At 25.0 s after launch, the rocket fires the second stage, which suddenly boosts its speed to 132.5 m/s upward. This...

Homework Statement A rocket is fired at at speed fo 75.0 m/s from ground level, at an angle of 60.0 deg. above the horizontal. The rocket is fired toward an 11.0 m high wall, shich is located 27.0 m away. The rocket attains its launch speed in a negligibly short period of time, after...

Homework Statement Just started an introductory college physics I course. I'm interested in the course but I'm having a hard time grasping the concepts. I'm not great at math but you guys probably won't have a hard time with this problem. If somebody could help me that'd be great thanks. A cart...

Homework Statement Two rocket ships, each with a rest length of 100 meters. Rocket 1 is at rest in frame S and has nose at x=0, tail at x = +100 meters. Rocket 2 is at rest in frame S' and has nose at x' = 0 and tail at x'=-100 meters. Suppose S' moves with speed V in the positive x...

Hello, I am hoping to build a model rocket with a roll control system for my senior project. Since the idea of building or obtaining a wind tunnel seems infeasible I will need to theoretically calculate how this rocket will behave with various canard fin angles and at various air speeds. I...

I would like to seek your assistance and help regarding my project, and I would like to know if you have an ideas for projects on an appropriate level of required skill related to rocketry. Presently i have two field options in mind .. .structures and CFD and i have a thinking about...

A rocket ship leaves Earth at a speed of 3/5 c. When a clock on the rocket says 1 hour has elapsed, the rocket sends a light signal back to earth. When was the signal sent according to clocks on earth? So we have T_earth and T_rocket and they are proportional. I am confused about which...

Homework Statement th rocket driven sled sonic wind no. 2 used for investigating the physiological effects of large accelerations, runs on a straight, level track 1070m long. Starting from rest. it can reach a speed of 224m/s in 0.900s compute for its acceleration assuming that it is constant...

Greetings ladies and gentlemen, I'm a high schooler, currently involved with a project regarding water-bottle rockets. My goal is to measure the force output of various water-air ratios of a water-rocket through force-sensors, and from that determine the maximum height reached by the rocket...

FYI: http://www.rutherford-research.ca/rrx/aerospace/nextGenPropulsion.php Click link above to see pictures and description.

Hey guys, I didn't really know where to put this and this seemed like the most logical place. Also sorry if there's already been a post like this, I tried searching and couldn't find anything. Anyway, onto the question. I'm sort of confused about some things to do with rockets and such. First...

I know mostly that a rocket has acceleration when it is being launched, but does it still keep acceleration when it continues to fly? because my teacher said when this rocket goes up, the speed is decelerating due to gravity. Does this situation only for the rocket that doesn't have acceleration...

1. If a ball dropped from a person's hand, and it then undergoes a free fall. The acceleration is 9.81m/s^2, if it undergoes a uniform acceleration, can i use the formula, d=Vt to find the distance it travels? or if it relates to the gravity, i must only use the formula with a, for instance...

1. A shuttle bus slows down with an average acceleration of -1.8m/s^2. How long does it take the bus to slow from 9.0m/s to a complete stop? For this question, we can immediately say that the final velocity is 0m/s because it stops. Now let's take a look at the second question: A robot probe...

I need to test a model rocket which will have average airspeeds around 200 mph. I am hoping to construct a plexiglass box about 9 feet long, 3 feet wide and 3 feet tall. For these dimensions and airspeed requirements it looks like I'd need a 160000 cfm blower. Is this something I can feasibly...

I have been reading a bit lately about project orion and the NERVA project. Project orion seems like such a crazy project that you can't help to love it:approve: I am not suprised it got shut down however. But is there any research going on anymore in the states or any other country that is...

I have a feeling someone is going to be like "Duhhh" on this one. But I got to thinking. I recall reading somewhere that the guy that came up with the rocket engine for use in space got an F on his paper because "I think" the professor said that there would be nothing to push back on the...

Homework Statement a rocket of mass 1.5e6 kg is launched upward from the surface of the Earth (mass Me =5.97e24, radius Re = 6.38 X 10^6m) with a speed of 0.5 x 10^4 m/s. What is the maximum altitude the rocket will reach above the surface of the Earth? Homework Equations 1/2 mv1^2 -...

I am interested in building a rocket with feedback control system... so I have been interested in model rocketry lately and I was wondering how feasible it would be to design and build a model rocket for my senior project complete with a control system to ensure it flies straight up. I was...

"launch a weather rocket" prbm Homework Statement A 1000 kg weather rocket is launched straight up. The rocket motor provides a constant acceleration for 11 s, then the motor stops. The rocket altitude 15 s after launch is 4600 m. You can ignore any effects of air resistance. a) Acc. of...

Homework Statement Initial mass of the rocket is M = 30 x 10^3 kg, while its initial acceleration a = 3g. The rocket has four nozzles of diameter D = 20 cm each. Burning fuel leaves the nozzle with velocity v = 2.0 km/s having temperature T = 600◦C. Assuming fuel is burned completely and the...

The height that a model rocket launched from Earth can reach can be estemated by assuming that the burn time is short compared to the total flight time, so for most of the flight the rocket is in free-fall. (This estimate neglects the burm time in calculations of both time and displacement. )...

accord. to Newton's laws, action <=> reaction, like how a balloon moves up if u blow air in it and then leave it at once...the air comes out with a force(action) and the balloon moves up(reaction)...the same principle in rocket...but with a difference...the gas actually burns...so the question...

Oh crap,my teacher asked me to participate in the coming Science Fair in my school.I have to make a rocket that can fly.How to do one?

1. Homework Statement A model rocket of mass 4.8 x 10^2 g accelerates vertically upward at 34.m/s2. Calculate the thrust force applied by the rocket if the air resistance is 2.4N 2. Homework Equations F=ma? 3. The Attempt at a Solution Converted into SI rocket mass = 0.48g...

I know it isn't generally kosher to link other forums, but this is just too crazy to pass up. An astrophotographer in Perth happened to be out taking a wide-angle picture of just the right part of the sky when a Russian rocket booster exploded and fell to earth. The pic is a single 30 minute...

Problem: A rocket is launched vertically upward. The rocket has a mass Mr and carries Mo of fuel. The fuel burns at a constant rate (ß) and leaves the rocket at speed Ve relative to the rocket. Assume constant gravity (9.8m/sec^2). There is an air resistance given by F(a) = -kV. Where V is the...

Homework Statement A 0.2-lb model rocket is launched vertically from rest at time t=0 with a constant thrust of 2 lb for one second and no thrust for t > 1 sec. Neglecting air resistance and the decrease in mass of the rocket, determine (a) the maximum height h reached by the rocket, (b) the...