Sethioz wrote:why would plank travel on speed of sound ???? it travels as fast as you can move it, however in theory it should be faster than speed of light, that is if that plank would be light enought. if its 1 light year away, that plank would probably weight more than earth and it would be impossible to move.
If there would be light enought material that can be moved, it would press the button as soon as you move the plank, since it does not have to travel anywhere. it is already in present, near you and near button, therefore it doesn't have to travel more than like 1cm (or however far it is from button).
i think it would work, but only in theory, since there are too many variables.
Legu wrote:What do u mean by speed at all? V= S/T?
You're wrong. When you push something it doesn't move instantly, the "message" wave of the push is send from one end to the other in the material and this "message" wave moves at the speed of sound.So if you calculate how much time it will take speed of sound to travel 1 lightyear through wood, it will be around 50,000 years or more. It's almost impossible to notice this with small objects but with larger objects you can notice it when seen in slow motion.
Legu wrote:
It doesnt have a speed because it simply doesnt exist in spacetime. It is like talking about 3d objects. Have u ever seen in ur life a 3d object? No. U live in 4d. Everything consists of infinity many 3d object, where we can refer that the 4th dimension is duration. So, when u talk aobut a cube, u cant trully imagine it, because u see it with your eyes. And your eyes need time to see it. (Light travels from ur eyes to the object and bk) Same goes when u look into space. U see objects, stars or whatsoever far away, however it is possible that they dont even exist anymore. Some of them might still exist though, but the idea is that u spee in spacetime.
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