Read about rockets | 14 Discussions | Page 1

  1. C

    Is Specific impulse indicative of performance as a gun propellant?

    Black powder has specific impulse of around 80s, while rocket candy has up to 130s of specific impulse. Does that mean I could replace the propellant in a BP cartridge with 80/130 of the weight in rocket candy and obtain the same performance in an idealized gun? (as in without considering...
  2. P

    I Calculations on a fireworks rocket?

    So I'll soon be writing an assigntment on the physics and chemistry behind firework rockets and thats why i'm here! I've already prepared for the chemistry part but when it comes to the physics part then im a bit lost. Bare in mind that i'm supposed to learn something new (myself) and explain...
  3. Benjamin Fogiel

    A rocket burns out at an altitude h above the Earth's surface

    Homework Statement A rocket burns out at an altitude h above the Earth's surface. Its speed v0 at burnout exceeds the escape speed vesc appropriate to the burnout altitude. Show that the speed v of the rocket very far from the Earth is given by v=(v02-v2esc)1/2 Homework Equations KEf-KEi=Ui-Uf...
  4. Kevin

    I Pressure Gradient for Nitrous Flow

    Hello everyone, I am currently working on an undergraduate club team for the Intercollegiate Rocket Engineering Competition. I am attempting to do a calculation to determine the pressure needed in a vessel leading to another pressurized combustion chamber to achieve a desired mass flow rate...
  5. Rednecknav

    I Space Trash

    How much energy needs to be be expended to throw a non operating satellite (or other space trash) out of orbit (L4 or L5) or L2 into deeper space.... thus minimizing space debris in earth orbit. I could only find formulas for getting an object INTO orbit.... Background of question: we were...
  6. S

    B How do rockets propel themselves up?

    Well, first thing, I am new to this forum and it looks pretty good and I'm looking forward to reading more from it and post more questions. Well rocket propeling (or anything that uses some material to propel up when shooting it down) seems pretty straight forward at first, you have some gas...
  7. C

    A rocket ship leaves earth at a speed 0.6c. When a clock...

    Homework Statement A rocket ship leaves earth at 0.6c. The clock of the rocket says 1hr has elapsed. (a.) According to the earth clock, when was the signal SENT? (b.) According to the earth clock, how long after the rocket left did the signal arrive BACK on earth? (c.) According to the rocket...
  8. SteveManPhy076

    Theoretical Floating Cities

    Could there perhaps ever be floating cities? If we could get the type of technology that sends rockets into space, and have the boosters running at a constant and equal velocity inversely, could this cause anything to levitate? If so, would this even be habitable? Considering that the fumes...
  9. pioneerboy

    Quit undergrad physics -- Wishes and options? Advice please

    Hello everyone, I am brand new here in the PhysicsForum and this is my very first message. So it's apleasure to meet likeminded people sharing the same interest and probably also profession. The latter is also the reason why I finally registered in this forum and I sincerely hopethat I am given...
  10. K

    At what speed does stuff burn up?

    hi, everyone. something iv been pondering recently, is there a set speed at which something burns up in the air/atmosphere, or is it more to do with the surface area of the object traveling through the air, which would mean more of a drag force which means that the extra energy transforms to...
  11. K

    Rocket Equation-esque Problem

    Homework Statement A truck hauling a big tank of oil starts at position x=D (Chicago) and heads due west (–x direction) toward its destination at x = 0 (Des Moines). At Chicago, the total mass of the loaded truck is M and the mass of oil it is carrying is λM. (Thus M(1–λ) is the "tare" mass =...
  12. P

    Orbital Semi Latus Rectum

    Hi. I have recently been trying my hands at calculating a few orbits but have encountered difficulties in trying to 'understand' the semi latus rectum. P=h^2/GM What does it have to do with the orbiting object's angular momentum? How come I get different values when I derive it from other...
  13. pixartist

    Calculate thrust of a rocket in order to approach and keep a position is space ?

    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...
  14. B

    Calculating delta v loss

    How do you calculate how much delta v is lost from gravity and atmospheric drag? I've been looking for days but I can't find anything that actually tells me how it's calculated. For example it takes 1.5 km/s - 2 km/s extra delta v for a low earth orbit because of drag loss, how was that number...
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