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quote:Originally posted by qpanThe increase in (relativistic) mass can be explained by light speed constancy. The faster you travel, the more distance you actually need to cover to travel through the same amount of space-time. Therefore, to accelerate, you need to put in more energy than you initially did to obtain the same acceleration at slower speeds. Therefore, for f=ma to continue working at high speeds, the "m" needs to be increased. Mass can be viewed as resistance to change in momenutm, and as you can see, the resistance to change in momentum will be greater if you need to put in more force to accelerate it.The particle, however, does not feel its mass increasing, thus why it is called relativistic mass.(as the particle could say that it is the one at rest and the observers are travelling towards it at light speed).If I rephrase your question slightly- if the train was travelling at 99.9% the speed of light (as because it has mass, it is not possible of it to travel at the speed of light) and you ran through it at 10km/h, the speed of you relative to the observers will becaome something like 99.9000000000000000000...etc..001% the speed of light (or something like that). This is due to the warping of space time (time would distort so that you would not break the light speed barrier- as to both you and the observers, the speed of light is constant).I think i was wrong to say that you would not be able to run at 10km/h if you were travelling very fast. If you consider the train to be stationary and the observers to be travelling towards you at 99.9% the speed of light (as you are perfectly entitled to do due to relativity), then you could obsiously easily run at 10km/h, so this must still be true even thought the train is travelling at near light speed. However, your relative velocity to the observers would not change by 10km/h due to the distortion of space and time."I have great faith in fools; self-confidence my friends call it."-Edgar Allan Poe*************************************************************""""""If the mass tends to become infinite as we approach the speed of light then light also should have infinite mass.my question is why doesnt light hurt us or why it has negligible mass or i mean no mass.why is it in quantas.can mass also be converted into quantas to travel at the speed of light?""""""" ******************************************************************

quote:Originally posted by victorquote:Originally posted by qpanThe increase in (relativistic) mass can be explained by light speed constancy. The faster you travel, the more distance you actually need to cover to travel through the same amount of space-time. Therefore, to accelerate, you need to put in more energy than you initially did to obtain the same acceleration at slower speeds. Therefore, for f=ma to continue working at high speeds, the "m" needs to be increased. Mass can be viewed as resistance to change in momenutm, and as you can see, the resistance to change in momentum will be greater if you need to put in more force to accelerate it.The particle, however, does not feel its mass increasing, thus why it is called relativistic mass.(as the particle could say that it is the one at rest and the observers are travelling towards it at light speed).If I rephrase your question slightly- if the train was travelling at 99.9% the speed of light (as because it has mass, it is not possible of it to travel at the speed of light) and you ran through it at 10km/h, the speed of you relative to the observers will becaome something like 99.9000000000000000000...etc..001% the speed of light (or something like that). This is due to the warping of space time (time would distort so that you would not break the light speed barrier- as to both you and the observers, the speed of light is constant).I think i was wrong to say that you would not be able to run at 10km/h if you were travelling very fast. If you consider the train to be stationary and the observers to be travelling towards you at 99.9% the speed of light (as you are perfectly entitled to do due to relativity), then you could obsiously easily run at 10km/h, so this must still be true even thought the train is travelling at near light speed. However, your relative velocity to the observers would not change by 10km/h due to the distortion of space and time."I have great faith in fools; self-confidence my friends call it."-Edgar Allan Poe*************************************************************""""""If the mass tends to become infinite as we approach the speed of light then light also should have infinite mass.my question is why doesnt light hurt us or why it has negligible mass or i mean no mass.why is it in quantas.can mass also be converted into quantas to travel at the speed of light?""""""" ******************************************************************victor

quote:[] i think i got the idea(almost).But u have definetly encouraged me to do some research on this.I already got some books from the library to learn more about einstiens relativity.INTRODUCTION TO SPECIAL RELATIVITY By Robert ResnickSPECIAL RELATIVITY By A.P.French****HEY QPAN DO U HAVE ANY REFRENCES FOR ME WHICH U THINK WILL BE GREAT BOOKS TO READ.I MEAN DO U HAVE ANY FAVOURITES.*****victor

quote:Originally posted by gsmollinThe fundamental tenent of relativity is that the free-space magnitude of velocity of light is a constant, and is the maximum velocity that mass/energy may travel at. After that, neither space or velocity can be conserved, but are added together using the relativistic transformations originally developed by Lorentz, that work so that c+10km/hr cannot be added together.Mass is also not conserved, but MOMENTUM (mv) IS CONSERVED. This is crucial. Since velocity is not conserved, but momentum is, then mass cannot be conserved. To observers moving at different relativistic velocities, a mass will change its value, so that the momentum of the mass is always mv. The velocities will add according to the Lorentz transformations, and so always add to less than c, but the momentum must be conserved, so the mass increases. This fact actually leads to the derivation of the mass transformation, with its famous result that the mass of an object traveling at c is infinite, and therefore no massive object can travel at c.

[]i think i got the idea(almost).But u have definetly encouraged me to do some research on this.I already got some books from the library to learn more about einstiens relativity.******THANK U VERY MUCH FOR EXPLAINING ME THE IDEA******victor