- #1
spikenigma
- 61
- 0
before I start, I should say that I'm a layman and as such will probably say something which sounds quite stupid to the rest of you. I will clarify anything that needs clarifying
Ok, so we have
A - a 2 light year long garage with two doors that can swing open and closed
B - a 4 light year long pole with engines on every inch of it, so that it can decelerate (near) equally along every part of itself to an arbitrary degree < c.
I have two scenarios:
Scenario 1: The FTL Message
http://img234.imageshack.us/img234/8303/47232114mq8.gif
with respect to the garage
http://img234.imageshack.us/img234/6140/30362184hf9.gif
with respect to the pole
http://img234.imageshack.us/img234/3179/17950915xl4.gif
The pole is traveling at a constant velocity of 0.88c and as such undergoes length contraction. It is approx 47% of its rest length with respect to the garage.
It is programmed to calculate ahead of time to decelerate along its entire length when (WRT the garage) the pole's end point has reached the garrage middle.
When the pole's end reaches the mid point of the garage (WRT the garage), somebody places a message on it's end, the pole then decelerates at 0.99..c
WRT: Garage
http://img234.imageshack.us/img234/2713/21404973wj5.gif
WRT: Pole
http://img234.imageshack.us/img234/9695/33047538tu6.gif
Now, as far as I understand it. At the point of placing the message from the point of view of the pole, it's end hasn't actually crossed the threshold of the garage and is still outside but the message from the garage mid-point is on it.
With respect to the garage, the pole is fully inside at the time the message is placed. Both the pole and the garage can agree at what time the message is placed.
WRT: Both
http://img185.imageshack.us/img185/4840/48958484mb4.gif
has the message traveled FTL?
Scenario 2: The status of the door in objective reality
http://img234.imageshack.us/img234/8303/47232114mq8.gif
with respect to the garage
http://img234.imageshack.us/img234/6140/30362184hf9.gif
The pole is once again traveling at a constant velocity of 0.88c and as such undergoes a length contraction and is approx 47% of its rest length with respect to the garage.
It is again programmed ahead of time to decelerate along its entire length (near) simultaneously with respect to itself when its mid point reaches the mid point of the garage (from the frame of the garage).
http://img185.imageshack.us/img185/8130/60901481yi1.gif
With respect to the garage, the pole is fully inside. The garage doors swing shut
http://img111.imageshack.us/img111/5316/11gy0.gif
now one of two things happens:
http://img185.imageshack.us/img185/5449/10ug4.gif
a. the pole stops inside the garage, expands along its length and breaks through the garage door(s)
b. the pole stops, but hasn't actually crossed one or more of the garage doors so the garage door(s) crash down onto the pole
(it seems embeded images don't work on this forum)
have at it... :)
Ok, so we have
A - a 2 light year long garage with two doors that can swing open and closed
B - a 4 light year long pole with engines on every inch of it, so that it can decelerate (near) equally along every part of itself to an arbitrary degree < c.
I have two scenarios:
Scenario 1: The FTL Message
http://img234.imageshack.us/img234/8303/47232114mq8.gif
with respect to the garage
http://img234.imageshack.us/img234/6140/30362184hf9.gif
with respect to the pole
http://img234.imageshack.us/img234/3179/17950915xl4.gif
The pole is traveling at a constant velocity of 0.88c and as such undergoes length contraction. It is approx 47% of its rest length with respect to the garage.
It is programmed to calculate ahead of time to decelerate along its entire length when (WRT the garage) the pole's end point has reached the garrage middle.
When the pole's end reaches the mid point of the garage (WRT the garage), somebody places a message on it's end, the pole then decelerates at 0.99..c
WRT: Garage
http://img234.imageshack.us/img234/2713/21404973wj5.gif
WRT: Pole
http://img234.imageshack.us/img234/9695/33047538tu6.gif
Now, as far as I understand it. At the point of placing the message from the point of view of the pole, it's end hasn't actually crossed the threshold of the garage and is still outside but the message from the garage mid-point is on it.
With respect to the garage, the pole is fully inside at the time the message is placed. Both the pole and the garage can agree at what time the message is placed.
WRT: Both
http://img185.imageshack.us/img185/4840/48958484mb4.gif
has the message traveled FTL?
Scenario 2: The status of the door in objective reality
http://img234.imageshack.us/img234/8303/47232114mq8.gif
with respect to the garage
http://img234.imageshack.us/img234/6140/30362184hf9.gif
The pole is once again traveling at a constant velocity of 0.88c and as such undergoes a length contraction and is approx 47% of its rest length with respect to the garage.
It is again programmed ahead of time to decelerate along its entire length (near) simultaneously with respect to itself when its mid point reaches the mid point of the garage (from the frame of the garage).
http://img185.imageshack.us/img185/8130/60901481yi1.gif
With respect to the garage, the pole is fully inside. The garage doors swing shut
http://img111.imageshack.us/img111/5316/11gy0.gif
now one of two things happens:
http://img185.imageshack.us/img185/5449/10ug4.gif
a. the pole stops inside the garage, expands along its length and breaks through the garage door(s)
b. the pole stops, but hasn't actually crossed one or more of the garage doors so the garage door(s) crash down onto the pole
(it seems embeded images don't work on this forum)
have at it... :)
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