My Query is quite simple........


Why can't a body simply accelerate and exceed the velocity of light????????

Just increase the velocity by some m/s for some time to reach the C ....!

Indeed its very simple. Look into the FAQ files for the Twin Paradoxon.
The moving twin coming back e.g. from Sirius needed only e.g. 4 years on his
clock.
And the distance is about 8 lys. so 16ly years in 4y shiptime gives about
avg. 4c.
But observers on earth measure that the ship has never exceeded 1c.
Its a question of where you are.

rgds Rudi

"Jean" schrieb im Newsbeitrag
om...
My Query is quite simple........


Why can't a body simply accelerate and exceed the velocity of
light????????

Just increase the velocity by some m/s for some time to reach the C ....!

"Jean" wrote in message om...
My Query is quite simple........


Why can't a body simply accelerate and exceed the velocity of light????????

Just increase the velocity by some m/s for some time to reach the C ....!

This may not be quite the answer you were expecting
but you need to consider what you mean by 'why'.

If you mean 'why' in its most fundamental sense then the
question is outside the scope of physics. All we can say
is that no one has ever observed an object to travel faster
than light.

If you mean, how does our current theory of space and
time (relativity) deal with an attempt to travel faster than
light then I can give some examples below.

Suppose you fire one particle in one direction at three
quarters of the speed of light and another at the same
speed in the opposite direction (which is quite easy to do).
You now have an observer on one of the particles (a
little harder to do but possible, in principle) who measures
the relative speed of the other particle. According
to traditional (Galilean) physics, the observer would
measure a relative speed of 1.5 times the speed of light
but relativity has a formula for calculating the relative speed
(which you can find in any relativity text book) that always
gives an answer of less than the speed of light.

Suppose you have a rocket that produces constant
thrust and thus accelerates indefinitely. (It would have
what is known in relativity as a constant proper
acceleration.) If we observe this rocket from the
frame of reference in which the rocket was originally
at rest, we would find that the measured acceleration
would decrease (according to a formula you might
search for under 'relativistic rocket') as the speed of light
was approached such that the speed of light is never
exceeded.

Finally, consider applying a force to an object in
order to try to maintain a constant acceleration
in its initial frame of reference. As the velocity
increases, it is found that the force required to
maintain a constant (coordinate) acceleration
increases in such a way that to reach the speed of
light an infinite force would be required.

Overall, we have one theory (relativity) which
mathematically describes motion in world in
which we live, and which has been found to be
in complete agreement with experiment. This
theory makes it impossible for an object to
reach the speed of light.

Martin Hogbin

"Jean" wrote in message
om...
My Query is quite simple........


Why can't a body simply accelerate and exceed the velocity of
light????????

Just increase the velocity by some m/s for some time to reach the C ....!

The faster the body goes the greater its mass becomes since mass is a
function of velocity even though your rest mass remains the unchanged. As
you appoach c your mass will become infinite. That means the momentum
becomes infinite since mass is defined as the "m" in p = mv. So while v is
still finite, m becomes infinite. It would require a force greater than
infinity to accelerate to or past c. This follows from the fact that force
is the time rate of change of momentum.

See also -- http://www.fnal.gov/pub/inquiring/qu...accel_obj.html

Pmb

"Jean" wrote in message
om...
My Query is quite simple........


Why can't a body simply accelerate and exceed the velocity of
light????????

Because the medium that propagate the energy used for acceleration is being
conducted
at a speed of c. So there is no way that a body can exceed the speed of the
energy
that is being used to accelerate it.

Just increase the velocity by some m/s for some time to reach the C ....!

NO.

Ken Seto

"Rudolf Drabek" wrote in message
...
Indeed its very simple. Look into the FAQ files for the Twin Paradoxon.
The moving twin coming back e.g. from Sirius needed only e.g. 4 years on
his
clock.
And the distance is about 8 lys. so 16ly years in 4y shiptime gives about
avg. 4c.
But observers on earth measure that the ship has never exceeded 1c.
Its a question of where you are.

Ah....but you can't compare the ship's 4 clock years with the earth's 16
clock
years directly. Why? Because the passage of a clock year in the ship is not
equal to the passage of a clock year on earth. To make the comparison you
must convert the ship's clock years to the earth's clcok year as follows:
Converting the ship's time to earth time=gamma*4 ship's clock years
=16
earth's clcok years.
What this means is that a physical clock is NOT a universal clock. A clock
second does not contain the same amount of universal time (absolute time)
in all frames of reference.

Ken Seto





rgds Rudi

"Jean" schrieb im Newsbeitrag
om...
My Query is quite simple........


Why can't a body simply accelerate and exceed the velocity of
light????????

Just increase the velocity by some m/s for some time to reach the C
.....!

"Jean" wrote in message
om...
My Query is quite simple........


Why can't a body simply accelerate and exceed the velocity of
light????????

Just increase the velocity by some m/s for some time to reach the C ....!
No reason, if you have enough energy you can.
Androcles

"Rudolf Drabek" wrote in message
...
Indeed its very simple. Look into the FAQ files for the Twin Paradoxon.
The moving twin coming back e.g. from Sirius needed only e.g. 4 years on
his
clock.
And the distance is about 8 lys. so 16ly years in 4y shiptime gives about
avg. 4c.
But observers on earth measure that the ship has never exceeded 1c.
Its a question of where you are.

rgds Rudi
Nonsense.



"Jean" schrieb im Newsbeitrag
om...
My Query is quite simple........


Why can't a body simply accelerate and exceed the velocity of
light????????

Just increase the velocity by some m/s for some time to reach the C
.....!

"Martin Hogbin" wrote in message
...

"Jean" wrote in message
om...
My Query is quite simple........


Why can't a body simply accelerate and exceed the velocity of
light????????

Just increase the velocity by some m/s for some time to reach the C
.....!

This may not be quite the answer you were expecting
but you need to consider what you mean by 'why'.

If you mean 'why' in its most fundamental sense then the
question is outside the scope of physics. All we can say
is that no one has ever observed an object to travel faster
than light.

If you mean, how does our current theory of space and
time (relativity) deal with an attempt to travel faster than
light then I can give some examples below.


You mean YOUR current theory, not mine.

Suppose you fire one particle in one direction at three
quarters of the speed of light and another at the same
speed in the opposite direction (which is quite easy to do).
You now have an observer on one of the particles (a
little harder to do but possible, in principle) who measures
the relative speed of the other particle. According
to traditional (Galilean) physics, the observer would
measure a relative speed of 1.5 times the speed of light
but relativity has a formula for calculating the relative speed
(which you can find in any relativity text book) that always
gives an answer of less than the speed of light.

Suppose you have a rocket that produces constant
thrust and thus accelerates indefinitely. (It would have
what is known in relativity as a constant proper
acceleration.) If we observe this rocket from the
frame of reference in which the rocket was originally
at rest, we would find that the measured acceleration
would decrease (according to a formula you might
search for under 'relativistic rocket') as the speed of light
was approached such that the speed of light is never
exceeded.

Finally, consider applying a force to an object in
order to try to maintain a constant acceleration
in its initial frame of reference. As the velocity
increases, it is found that the force required to
maintain a constant (coordinate) acceleration
increases in such a way that to reach the speed of
light an infinite force would be required.

Overall, we have one theory (relativity) which
mathematically describes motion in world in
which we live, and which has been found to be
in complete agreement with experiment. This
theory makes it impossible for an object to
reach the speed of light.

Martin Hogbin
What a load of old rubbish.
Androcles

"Pmb" wrote in message
...

"Jean" wrote in message
om...
My Query is quite simple........


Why can't a body simply accelerate and exceed the velocity of
light????????

Just increase the velocity by some m/s for some time to reach the C
.....!

The faster the body goes the greater its mass becomes since mass is a
function of velocity even though your rest mass remains the unchanged. As
you appoach c your mass will become infinite. That means the momentum
becomes infinite since mass is defined as the "m" in p = mv. So while v is
still finite, m becomes infinite. It would require a force greater than
infinity to accelerate to or past c. This follows from the fact that force
is the time rate of change of momentum.

See also -- http://www.fnal.gov/pub/inquiring/qu...accel_obj.html

Pmb
Nonsense. Prove it.
Androcles