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Old 10-25-2019, 6:38pm   #1
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Default Light Speed....Fizzicks???

So lets say we have a space ship traveling at speed of light......if we aim a flashlight out front of it, what happens to the light?? does to travel at twice the speed??

or for that matter out the back of the ship.....does it ever travel at all??

Watt say you folks?? curious as to why, also.......
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Old 10-25-2019, 6:54pm   #2
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Please put it on a treadmill for me to give you a proper answer.
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Old 10-25-2019, 7:19pm   #3
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Please put it on a treadmill for me to give you a proper answer.
cracks me up, but I remember a thread involving a treadmill, long ago.....but can't remember the gist of it......it was funny though....
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Old 10-25-2019, 8:27pm   #4
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Please put it on a treadmill for me to give you a proper answer.
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cracks me up, but I remember a thread involving a treadmill, long ago.....but can't remember the gist of it......it was funny though....
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Old 10-25-2019, 9:07pm   #5
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Just remember to use the low beam on your flashlight when going the speed of light, and you should be fine.
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Old 10-26-2019, 7:12am   #6
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cracks me up, but I remember a thread involving a treadmill, long ago.....but can't remember the gist of it......it was funny though....
One of the many epic old threads from that other place
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Old 10-26-2019, 9:10am   #7
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The people on the ship would see the light shine normally. An observer would see the ship’s occupants frozen in time essentially.
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Old 10-26-2019, 10:19am   #8
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Old 10-26-2019, 12:23pm   #9
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Weird thought, since no friction in outer space, I wonder if shining a light out back ass of a space ship would propel it forward, as the radiation was going to the rear/aimed out the ass...... IF so eventually be going so fast the light never leaves the source.....

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Old 10-26-2019, 1:56pm   #10
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Old 10-26-2019, 1:57pm   #11
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It is possible to use light to propel ships in space. Search for "light sail". The idea would be to use powerful lasers powered by, say, huge solar arrays near the sun. These lasers would focus on the light sail attached to the spacecraft, and the pressure of the photons bouncing off the light sail would, over time, accelerate it to a significant fraction of the speed of light. The problem is that once it is out of range of the lasers, it's on its own with no way of slowing down unless it has some other form of propulsion but if it did it would probably be too massive for this to work in the first place.
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Old 10-26-2019, 2:07pm   #12
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Gene, the easiest way to understand Special Relativity, which covers the realm of your questions, is to think of space-time as four dimensions, of which one is time. In this four dimensional space-time, everything. And I do mean everything moves at the speed of light in four dimensions. What? Bear with me.

You and I, we are right now moving pretty close to the speed of light in the direction of the time dimension (t). If we now start to accelerate to high velocities in one of the spacial dimensions (x, y, z) we start to reduce our velocity in the time dimension, because the total velocity which is the square root of vx^2+vy^2+vz^2+vt^2 must always equal c. If we put all our velocity in the spacial direction so that sqrt(vx^2+vy^2+vz^2) is nearly equal to c, then there will be almost no velocity at all in the time dimension.

The other thing to realize is that there is no place in the universe you can say "this is the center, and this is completely at rest in a given dimension(s)." The only way you can measure how fast something is moving is space-time is to have an observer. It's the relative motion between the two, the object and the observer, that allow us to make these measurements. And it doesn't matter if it's the object observing the observer, they will see the same things. If an observer sees something moving very close to the speed of light, say a ship, they will also see that the clocks on the ship are pretty much frozen in time. And that same ship, looking back to that observer, would see the observer's clocks frozen in time too.
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