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PAllen's latest activity
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PAllen
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Time dilation for two clocks at different altitudes on Earth
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You, could, of course. I was trying to realize the notion of potential in contrast to surface gravity, as a function of position.
Jul 28, 2025
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PAllen
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Insights
Fixing Things Which Can Go Wrong With Complex Numbers
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Thanks!
Jul 28, 2025
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PAllen
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Simple mass/scale puzzle
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I gave you a single diagram showing that, including where there is 20 kg force.
Jul 27, 2025
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PAllen
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Simple mass/scale puzzle
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Wait a minute - depends on whether the stationary car is able to roll, or how slippery the surface is. Extreme case: stationary car on...
Jul 27, 2025
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PAllen
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Simple mass/scale puzzle
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Well if you look at the crude diagram I posted some poste ago, you will see what balances the 20 kg.
Jul 26, 2025
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PAllen
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Simple mass/scale puzzle
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I don't know if this will help or not, and I don't have any drawing software, so here is a free hand diagram:
Jul 25, 2025
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PAllen
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Simple mass/scale puzzle
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The advantages of the old fashioned agate knife edge balance with weights. Good to one milligram easily. Tarnish on the weights was the...
Jul 25, 2025
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PAllen
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Simple mass/scale puzzle
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All the scenarios are the same, including the original. A string or spring under tension T means each element has a pair of Newtonian...
Jul 25, 2025
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PAllen
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Simple mass/scale puzzle
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Just replace string with spring in the argument. If the spring moves freely, it measures 0. If held stationary, it measures the force -...
Jul 24, 2025
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PAllen
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Simple mass/scale puzzle
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The tension in the string is the result of one end fixed and the other end under force. The nature of the fixing of one end is...
Jul 23, 2025
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PAllen
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Simple mass/scale puzzle
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Going with this idea, consider two rockets with equal thrust pulling on both end of a string. This presents the same ‘seeming’...
Jul 23, 2025
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PAllen
replied to the thread
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Time dilation for two clocks at different altitudes on Earth
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If you imagine two places on earth such that the total work to raise a small body from the surface to very far from earth was greater at...
Jul 22, 2025
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PAllen
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More similar triangle problems
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Here it is worked out: Sum of small triangles plus rectangle = large triangle $$\frac {1}{2}4a + \frac{1}{2}2b + ab =...
Jul 22, 2025
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PAllen
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More similar triangle problems
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Exercise for the reader: calling the 4 and 2 segments c and d, show that for a given rectangle area A, any choice of a and b, with ab=A...
Jul 22, 2025
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PAllen
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More similar triangle problems
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Your first instinct is correct.
Jul 22, 2025
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