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Everything posted by swansont
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TheCosmologist has been banned for sockpuppetry. We’re convinced he was Gareth. (which they basically confirmed)
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You need to work on paying attention to detail. Nowhere in the part you quoted did I use the equation F = ma I agreed that there is a term in there that is m dv/dt, which is a force. They derived this by looking at the momentum of the rocket of mass m has as the result of ejecting a mass ∆m. They did not arrive at this by applying F = ma In Newtonian physics, when considering conservation of momentum, mass can't change. Once you have defined the system (mass M) you can't change it. If a mass m2 is ejected, for example, leaving mass m1, you have to consider both masses, m1 and m2 = (m1 + m2 = M)
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There is no time dilation (split from The twin Paradox revisited)
swansont replied to Boltzmannbrain's topic in Speculations
Yes. "Relativity" means that some quantities, like time, are relative to the frame you are in. IOW, what you measure and what someone in another frame will measure, will disagree. In your own frame, your own clock ticks once per second. Your meter stick is a meter long. But there will be disagreement on how many seconds passed, and how far you traveled, when comparing to some other frame, because these are relative measurements. -
! Moderator Note You have not established that this happens. You can’t ask how something happens while begging the question of whether it does.
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No, because that’s not where it’s derived. It’s derived from conservation of momentum, and they divide by delta t, which they make into a derivative by taking the limit as delta t becomes small, just as clearly they explain. equation 1.3 through equation 1.5 Well, that simplification is wrong.They say it has dimension of force. The reason it’s a force is because it was arrived at by taking the time derivative of momentum, which is force, which they explained in equation 1.2. No. They didn’t apply F=m dv/dt, they derived it, and identify it as the reaction force
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They refer to them as forces because they are. They took momentum and applied dp/dt to it. dp/dt is a force, despite your insistence to the contrary. This is quite clearly spelled out in the derivation. What they did not do is apply F=ma to anything with variable mass. I don’t know how you can claim that they are.
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Referring to someone with other than their user name is poor etiquette, and a de-facto accusation of them being a sockpuppet is both off-topic and also a bad-faith post - they might not be. Rules violations should be reported. Let mods figure it out.
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There is no time dilation (split from The twin Paradox revisited)
swansont replied to Boltzmannbrain's topic in Speculations
The clocks in the Hafele-Keating experiment did not run at the same rate as the ground clocks. As such, they accumulated a different amount of elapsed time. GPS oscillators are adjusted to run slow on earth so that they run at the correct rate in space, to match the ground clocks. Time does not flow at the same rate for everything. -
No, they showed there was no electron dipole moment at some level. The article doesn’t say, because it’s a pop-sci report about the experiment. Which is why it uses language that a lay audience might identify with. I thought you were here to discuss physics, not the watered-down verbiage used in press releases and articles like that. How could a point charge have a dipole moment? I wasn’t aware Einstein was so involved in QM. Citations, please.
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There is no time dilation (split from The twin Paradox revisited)
swansont replied to Boltzmannbrain's topic in Speculations
How do clocks (such as used in the Hafele-Keating experiment) “perceive” time? -
When did these gentlemen provide a urine or blood test to confirm that they weren’t under the influence of one of the many drugs that were legal at the time? If you can’t rule out hallucinations, it’s not conclusive. It’s also curious that these aliens seem to use technology somehow familiar to the people - a luminous mineral for light, a shoulder bag containing gas (what gas would this be?) Those are not descriptions of advanced technology. ”the specific gravity of the creature was less than an ounce” for being seven feet tall? And they were carrying items! “outside of a large rudder there was no visible machinery” How does a rudder function in outer space? This is your best example of having “so much data”? You described this as “It reads so matter of fact but it's more like a guy detailing his experiences while drinking shroom tea.” Where is your calculation of this probability?