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Physics Forums's title: Physics Forums | Science Articles, Homework Help, Discussion

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Falcon 9 predicted lunar impact
https://www.cbc.ca/news/science/falcon9-rocket-moon-impact-9.7290981



"You need to be taking an image every tenth, hundredth of a second, something like that, to try and catch this brief flash," he said. "If you're trying to cat...

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Does a Particle's Identity Have a Physical Cost?
My question is: Does maintaining a particle's intrinsic identity require a continuous, irreducible physical cost?

I have been thinking about this for a long time and would like to hear the community's thoughts.

All physical theories treat a particle's intrinsic identity (mass, charge, spin) as...


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Are the basic axioms of thermodynamics demonstrated experimentally?
I would like to propose a very simple experiment and ask: what is the official thermodynamic prediction for this specific setup?
And, are such basic experiments performed during physics training, or do courses move directly to more complex experiments while taking the foundational axioms for...


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A question on solution 6.1-2 from CLRS
How to prove the following claim?

that: $$m=\lfloor \log_2 n \rfloor= \lfloor \lg n \rfloor$$
from $$n=2m+k−1$$
?

Obviously we have $$m=log_2(n−k+1)$$
.
##k## is the number of leaves.
My question has arisen from the solution here: h...

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Mass-and-spring model of parametric amplification
I was playing with a toy model ( HTML + JS ) involving a mass, spring and damping that lets you vary those parameters using sliders. In the process, I got interested in the idea of varying the stiffness in real time in order to demonstrate parametric amplification.

This does work pretty well...


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