1hey guys please write the name of topic wants to discuss in title
it will be easy for others
we know that a body can't exceed speed of light but can be just equal to it..i.e. 99.7% of speed of light...
we have not achieved that but ..it is possible...now........let it is achieved ...and a super spacecraft is moving with that much speed...
A STRANGE THING HAPPENS------A GIRL SITTING INSIDE THE SPACECRAFT STARTS RUNNING IN THE DIRECTION OF MOVEMENT OF SPACECRAFT ....
AS SPACECRAFT HAS SPEED JUST EQUAL TO SPEED OF LIGHT..
THE NET SPEED OF THE GIRL WILL BE = 99.7%C +X ,WHERE C IS SPPED OF LIGHT AND X IS THE SPEED OF RUNNING OF GIRL INSIDE THE SPACECRAFT..
IT IS POSSIBLE THAT GIRL'S SPEED=99.7%C+X BECOMES > C
ISN'T IT CONTRADICTORY..HOW CAN A BODY(GIRL) CAN HAVE SPEED MORE THAN SPEED OF LIGHT???? hmmm..
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33 Answers
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23agreed it is highly interesting , but it isnt in our syllabus right now ,
so we shudnt waste our time ,
btw i hav heard that the no of people that clearly hav understood Einstein's general and special theory of relativity are less ( may be in 100s ) ,
scientist banne ke liye jee ke baad bohot time hai ....
11@ Sahil, there is no point of proving that I am stupid by posts, I openly say that I am stupid.
And yeah I have lots of attitude, and I dont care about the people like you.
@ Nihal, I dont get angry on people who have problem with me, by doing that they are just proving how low they feel for themselves when I am around them.
1khayti u r frustrated by ma reply,n d oder thing z who says u hav atitude,hahaha.u r overestimating yourself,pic me to kafi cute lag rahi ho hahaha.
71Rename TIIT to TargetFIGHT .. LOL.
@Nihal
99.97%+c is possible. But that doesn't make any contradiction to the theory that there is nothing with any velocity higher than that of light (as of now known to us)
many wave velocities can exceed c. For example, the phase velocity of X-rays through most glasses can routinely exceed c,[41] but such waves cannot convey any information.
But they are meaningless.
1u have totally mistook the case ..... read carefully my post "okk.." above sahil's post....forget about frames and think about the case.....
1THIS SITUATION IS EXPLAINED BY THE HISTORY CHANNELS DOCUMENTARY OF STEPHEN HAWKING. TIME SLOWS DOWN AS WE REACH SPEED OF LIGHT AS A RESULT OF WHICH YTHE GIRL CAN NEVER EXCEED THE SPEED OF LIGHT. I PREFER ALL THOSE WITH GENIUINE INTEREST GO THROUGH THE DOCUMENTARY.
1nice one fahaad .....
if i remember correctly in that documentary the guy says
"time slows to save the speed of light ......."
guys these are the basic postulates of special theory of relativity
just wait for some time..u will do it in your first year
1yup that's well explained in the documentary by STEPHEN HAWKINS...and u can get more in his books...key idea is just that of "possiblity of making a time machine(? [3]) by using the fact that time slows to save the speed of light[5]"
1only God can answer this question correctly, & briefly.I will ask him after my death.
1i got the link to the video. the first link has part 2 if u want to see only the train situation, watch from 9th minute of this video.
http://www.youtube.com/watch?v=ykQZAgJJnSI&feature=related
then watch from beginning of this link
http://www.youtube.com/watch?v=jrKKGZpcXVY&feature=related
this is one of the programmes that inspired me to astrophysics.
1the reason:time will always slow down to save the speed limit. this leads to the possibility of time travel.
49Sorry to have noticed this question so late..! :(
but here i give the explanation to ur doubt..which, i am sorry to say will mutilate ur beautiful thought process!! :-(
assassin had given correct explanation! !
if we imagine the train to be moving forward with a velocity v1 and the runner inside it moving with a velocity v2 in the forward direction w.r.t. the movement of the train, we might expect, from our knowledge of classical newtonian mechanics, based on Galilean transformations, we would conclude that the velocity of the man w.r.t. ground is v1 +v2
but that is not true.
infact the laws of classical mechanics are not true...
we need to change our views to the lorentz transformations..
and according to te lorentz transformations,
v=(v1+v2)[1+(v1v2/c2)]
this answer may be readily derived as...
if the runner covers a distance of dx in time dt, his ground relative speed is v=dx/dt
from lorentz transformations we may write,
dx/dt= (dx'+v1dt')(dt'+v1dx'/c2)
or, dx/dt= [(dx'/dt') + v1][1+(dx'/dt')(v1/c2)]
or, v=(v1+v2)(1+v1v2/c2)
noth that as a consequence of velocity addition law, if the runner is replaced by a light wave(v2=c), then automatically v=c thus satisfying the second principle of relativity, which states that light's speed is constant for all inertial frames of reference.! :)
this law also implies, no matter what values of v1 and v2 we choose (if less than c itself) the resultant velocity is always less than c!! :)
1LOL dude......a Spacecraft is in space - where there is no gravity. How do you expect a girl to run inside it ? lolz
and its strange why you chose only a girl in your thought [4]
71@sahil..
Kabhi kabhi jokes bhi kar liya karo.. Itna padhoge toh kya hoga!! (Don't accuse someone like that!)
71ROFL!... There is no point in further discussion. Just look at what I have said, what you all are saying may exist but none of them prove that they are going faster than velocity of light.
Velocity has very intimate relationship with reference frame!
1for ur first post......... ha ha ha hmmm ha ha ha....khyati will be[5]
for ur second post.... i am not saying that it will happen but want the reason for the above case( i.e. why it is not possible...)
if this happens mass comes out to be -ve which is not possible......
hence above case is not possible....
but how will u explain whole phenomenon without sticking to formulas only.......
1nihal what u hav said ,if it can really be happen then i wil bcm very happy bcoz dat's the way to become invisible ,do u know?
1another way to look.....
suppose the supervehicle has an gun attached to the body of the vehicle externally...when the vehicle reaches speed 99.7% of c...gun is fired....
now the bullet may have velocity more than c ( speed of light)...dissappear the supervehicle now...u will see a bullet moving in speed more than speed of light.......
ABOVE EXAMPLE CAN BE UNDERSTOOD BY ANALYSING A FAST CRICKET BOWLER WHO RUNS BEFORE THROWING THE BALL TO ADD UP THE VELOCITY OF BALL WITH HIS OWN VELOCITY....
1things don't work so simple in relativistic mechanics
The velocity of girl wrt earth(if assumed at rest)=(v+x)1+(vx/c2)
where u is vel. of girl wrt spacecraft and v is vel of spacecraft wrt earth
all this is derived using lorentz transformations
71Very SImple :
"The rate of change in the distance between two objects in a frame of reference with respect to which both are moving (their closing speed) may have a value in excess of c. However, this does not represent the speed of any single object as measured in a single inertial frame."
11Am not agree in any way.
And about the possibilitis you only said .but that much speed can be gained by girl(body) with the help of external means .....don't go on words ....so think...just given example to let u understand the case i am talking about....also u can replace the spacecraft with a supervehicle on a place where gravity is present...
1if i agree with u then see girl will come out as her speed is greater than light ...okit's acc. to u....hence u agree that at any instant her speed will be greater than light & she will come out of the spacecraft.....(girl ki speed toh more than speed of light toh hui na..chahe woh bahar ajaye)
now u agree that a body can have speed greater than light ...tell me how this is possible ..many big scientists have clearly said that it is not possible......???
11Nihal if the gal is running inside the spacecraft then wont her speed be less than or equal to
the speed of the space craft???, and if her speed becomes greater than space craft then
she'll come out of the space craft(Think how would be this scene, this super power
possessing gal coming out of space craft, space craft toh toot jayega na?[3]), ab batao how
her speed is greater than light??