Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Relativistic_rocket> ?p ?o. }
Showing items 1 to 24 of
24
with 100 items per page.
- Relativistic_rocket abstract "A relativistic rocket is any spacecraft that is travelling at a velocity close enough to light speed for relativistic effects to become significant. What "significant" means is a matter of context, but generally speaking a velocity of at least 50% of the speed of light (0.5c) is required. The time dilation factor, mass factor, and length contraction factor (all these factors equal the Lorentz factor) are 1.15 at 0.5c. Above this speed Einsteinian physics are required to describe motion. Below this speed, motion is approximately described by Newtonian physics and the Tsiolkovsky rocket equation can be used.We define a rocket as carrying all of its reaction mass, energy, and engines with it. Bussard ramjets, RAIRs, light sails, and maser or laser-electric vehicles are not rockets.Achieving relativistic velocities is difficult, requiring advanced forms of spacecraft propulsion that have not yet been adequately developed. Nuclear pulse propulsion could theoretically achieve 0.1c using current known technologies, but would still require many engineering advances to achieve this. The relativistic gamma factor at 10% of light velocity is 1.005. The time dilation factor of 1.005 which occurs at 10% of light velocity is too small to be of major significance. A 0.1c velocity interstellar rocket is thus considered to be a non-relativistic rocket because its motion is quite accurately described by Newtonian physics alone.Relativistic rockets are usually seen discussed in the context of interstellar travel, since most would require a great deal of space to accelerate up to those velocities. They are also found in some thought experiments such as the twin paradox.".
- Relativistic_rocket wikiPageExternalLink rocket.html.
- Relativistic_rocket wikiPageExternalLink relativistic_photon_rocket.shtml.
- Relativistic_rocket wikiPageExternalLink relroket.htm&date=2009-10-25+12:17:16.
- Relativistic_rocket wikiPageID "417815".
- Relativistic_rocket wikiPageRevisionID "571316447".
- Relativistic_rocket hasPhotoCollection Relativistic_rocket.
- Relativistic_rocket id "a".
- Relativistic_rocket ref "Substituting in terms of and in equation and dividing by and yields Solving this equation for : From the basic laws of relativity, the infinitesimal relativistic momentum of the exhaust is Substituting : The specific impulse is, by definition, this infinitesimal momentum divided by the infinitesimal mass of the fuel: Substituting and simplifying results in the final formula:".
- Relativistic_rocket ref "This formula can be derived from the fact that a spaceship's total rest energy before using an infinitesimal amount of fuel has to be equal to the sum of the total relativistic energies of the accelerated fuel and the accelerated spaceship: We can get rid of the infinitesimal quantity in the denominator of the right hand side of the sum on the right hand side by calculating the Taylor series and ignoring everything except constant and linear terms. Because only the square of occurs to begin with, there will be no linear term in the Taylor expansion, and the denominator indeed becomes 1: Now the ship's rest energy cancels on both sides of the equation and we can rearrange the equation: Due to the definition of , the following equation holds:".
- Relativistic_rocket subject Category:Interstellar_travel.
- Relativistic_rocket subject Category:Spacecraft_propulsion.
- Relativistic_rocket comment "A relativistic rocket is any spacecraft that is travelling at a velocity close enough to light speed for relativistic effects to become significant. What "significant" means is a matter of context, but generally speaking a velocity of at least 50% of the speed of light (0.5c) is required. The time dilation factor, mass factor, and length contraction factor (all these factors equal the Lorentz factor) are 1.15 at 0.5c. Above this speed Einsteinian physics are required to describe motion.".
- Relativistic_rocket label "Relativistic rocket".
- Relativistic_rocket label "Relativistische Rakete".
- Relativistic_rocket label "Voyage relativiste".
- Relativistic_rocket label "相对论火箭".
- Relativistic_rocket sameAs Relativistische_Rakete.
- Relativistic_rocket sameAs Voyage_relativiste.
- Relativistic_rocket sameAs m.025zv5.
- Relativistic_rocket sameAs Q1056429.
- Relativistic_rocket sameAs Q1056429.
- Relativistic_rocket wasDerivedFrom Relativistic_rocket?oldid=571316447.
- Relativistic_rocket isPrimaryTopicOf Relativistic_rocket.