FactChecker's latest activity
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FactChecker replied to the thread Undergrad Light clock treating horizontal and vertical motion differently?.An inertial frame of reference is a mathematical construct to describe an undeniable physical fact. Anyone can feel acceleration... -
FactChecker replied to the thread Undergrad Light clock treating horizontal and vertical motion differently?.You're right, a postulate isn't necessarily a fact. This postulate was a way to explain experimental results. It is the simplest...
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FactChecker reacted to renormalize's post in the thread Can a flow created by a fan show an Edge effect when hitting a wall? with
Informative.
It's not difficult to find technical papers online that analyze 2D laminar flow around a rectangular cylinder. Here's one example picked... -
FactChecker replied to the thread Can a flow created by a fan show an Edge effect when hitting a wall?.If a stream with circular symmetry hits a wall, the center of the stream will have a zero velocity at the wall. The symmetry allows no...
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FactChecker replied to the thread Can a flow created by a fan show an Edge effect when hitting a wall?.The velocity at the center of impact with the wall is zero, so there is acceleration above zero around that. But it is another question...
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FactChecker replied to the thread Can a flow created by a fan show an Edge effect when hitting a wall?.The term "edge effect" is used at 15:50 in this video. Here is that part of the transcript: the VX175 has a specially engineered...
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FactChecker replied to the thread Can a flow created by a fan show an Edge effect when hitting a wall?.I don't see any use of the term "edge effect" in this video.
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FactChecker reacted to haruspex's post in the thread Undergrad Understanding permutations and combinations in a coin toss experiment with
Like.
Enumeration problems do not, in general, fall neatly into just the two categories. See https://en.wikipedia.org/wiki/Twelvefold_way. -
FactChecker reacted to DaveC426913's post in the thread Undergrad Acceleration calculation in Special Relativity with Like.
Yes. The four phases all have symmetrical profiles, just different choices of frames of reference. The starting velocity of phase 2 is...
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There was a fake video of the former Minister of Finance of Greece that was so realistic that it fooled a lot of people. Then when the...
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FactChecker replied to the thread Undergrad Understanding permutations and combinations in a coin toss experiment.In a two-toss experiment, if (H, T) is considered different from (T, H), you are counting permutations. If they are considered the same...
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Hi, may I remind you of the Homework Help Guidelines for Students and Helpers and ask for a few clarifications ? I spent some time...
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FactChecker reacted to berkeman's post in the thread Alien life, probabilities, and interstellar propagation of human life with Like.
Where do you get that from? It's more like life arose in many places on Earth at the same time after enough time had passed for several...
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FactChecker reacted to pinball1970's post in the thread Alien life, probabilities, and interstellar propagation of human life with Like.
That is not entirely correct. We do not know how life on earth began specifically but there a few ways that this could have got going...
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FactChecker reacted to PeroK's post in the thread Undergrad My basic understanding of set theory with
Love.
The basics are important. Things in mathematics are what they are defined to be. There is no single concept of "infinity" in...
