jbriggs444's latest activity
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The light clock is really very simple. If you accept the invariance of the speed of light, then time dilation, length contraction and... -
jbriggs444 reacted to PeterDonis's post in the thread I The Einstein Clock aka Light Clock with
Like.
What else would be involved? No, they don't. The source can only be motionless with respect to one of them. Until you fix this... -
jbriggs444 reacted to Ibix's post in the thread How to increase phone signal strength by lying about it with Like.
"Mate, your signal strength is always better than mine. What network are you with?"
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jbriggs444 replied to the thread Chain falling out of a horizontal tube onto a table.There are a number of conundrums that deal with the unexpected behavior of falling ropes and chains. It seems clear that you are not...
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jbriggs444 replied to the thread I Why is the speed of light the same everywhere in the Universe?.You understand that "energy" is not an invariant quantity, right? The amount of kinetic energy in a thing depends on the frame of...
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This is in violation of the Joint WarnerBros/Hanna-Barbera/Disney Convention defining how female cartoon characters are to be depicted...
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jbriggs444 reacted to A.T.'s post in the thread A Please Explain Elementary Physics Elevator Question with Like.
The observable effects depend on all forces acting, not just on gravity. So it makes no sense to describe them as effects of gravity...
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jbriggs444 reacted to Herman Trivilino's post in the thread A Please Explain Elementary Physics Elevator Question with Like.
No, it's wrong. But explaining it repeatedly seems to have no effect. I told you to stop trying to generalize comments you read and...
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jbriggs444 replied to the thread A Please Explain Elementary Physics Elevator Question.I would accept that. Gravity is the force of gravity. It is given by ##F_g = \frac{Gm_1m_2}{r^2}##. It acts on ##m_1## in the direction...
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Polaris is "up" from the north pole. North is a direction along the surface of the Earth.
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One possibility, known as the Hartle-Hawking no boundary proposal, is that if you go backward in time towards the big bang, you reach a...
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A subthread on how the "speed of expansion" of a material object is defined has been moved to a separate thread in the relativity forum...
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jbriggs444 reacted to Baluncore's post in the thread B 'splain this hydrostatic paradox in tiny words with Like.
By hiding some important details, they would get more clicks on the video. I expect identical glass pistons, that press on the scale...
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jbriggs444 replied to the thread B 'splain this hydrostatic paradox in tiny words.I assume that the mechanism includes some sort of identical pistons inside the vertical glass walled tubing. The scale pans are then...
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jbriggs444 replied to the thread B Why Do Events Freeze For Me at the Speed of Light?.Yes, there is a last instant of your home world's future that you will ever see. However, this last instant is not seen when you reach...
