Hearted Youtube comments on Veritasium (@veritasium) channel.
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Okay, I've watched it once. Only four more watches, after taking some notes, reading those, and then perhaps watching one or two more times, maybe I'll have a question.
That said... I feel like I am on to what you are saying.
Or a question, now, while it's hot on my mind. When I'm standing, and my muscles are pushing against the Earth to keep me up, am I accelerating against time which moves ever onward?
I think my question may be more refined, mature, after some further reflection, but if the aforementioned is worth answering, or commenting upon, please do.
Great video!
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I've questions :
a) Imagine that unbeknownst to you, one of the lines has been severed halfway to the moon - will the lightbulb still light up the same way, nanoseconds after you turn the switch?
b) If the answer is yes, why bother buying all that cable, wouldn't it suffice to have some kilometres of cable going left and right from the battery & switch, and from the lightbulb, without connecting one system to the other? Or maybe just some meters? Or some centimetres?
c) If the answer is no: Imagine some mischievous green three-legged alien cuts one of the two power lines halfway to the moon, one nanosecond before you turn on the switch. Would the lightbulb still light up? We would at this very moment be in situation a), and according to the assumed no-answer to a), the light would stay dark. But that would mean that severing the cable has an instant effect half a light-second away! In other words, the information "the cable has been severed" will have travelled faster than light!
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