PeroK's latest activity
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PeroK replied to the thread Undergrad Is calling fictitious forces "not real" just about terminology?.I think the onus is on you to provide evidence of PhD students who cannot explain how motion is possible given Newton's Third Law. -
PeroK reacted to hokhani's post in the thread Undergrad Angular Momentum Vector and Its Magnitude with
Like.
The calculations give ##|L_z=0\rangle =\sqrt{\frac{3}{8}} (|L_x=2\rangle +|L_x=-2\rangle ) - \frac{1}{2} |L_x=0\rangle## and we expect... -
PeroK reacted to JimWhoKnew's post in the thread Undergrad Angular Momentum Vector and Its Magnitude with Like.
I calculated it (with the aid of a mathematical software) and got the same result. In terms of ##~L_y~## eigenstates, replace...
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PeroK reacted to Ibix's post in the thread Undergrad The quintessence as variable dark energy with
Informative.
You can formally model the evolution of fluctuations via perturbation theory. As I understand it, the point isn't really that "voids... -
PeroK replied to the thread Undergrad Angular Momentum Vector and Its Magnitude.An interesting result! Is that your own calculation or did you find it somewhere?
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PeroK replied to the thread Undergrad The quintessence as variable dark energy.There are no voids in a homogeneous universe. If you want to study a local region of the universe, then you need to set up the...
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PeroK replied to the thread Undergrad The quintessence as variable dark energy.It's not applicable, except on the largest scales. The fundamental assumption is uniform mass and radiation density. Moreover, the...
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I'm wondering how you would treat a modern day Ramanujan. Would you shout at them; "Go back to school, and learn PROPER maths!" ? Ok...
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One thought that occurs to me is that virtually all learning is self-learning. If you enroll in a course and listen to the lectures but...
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PeroK reacted to wrobel's post in the thread Undergrad Is calling fictitious forces "not real" just about terminology? with Like.
I am sorry but I do not believe that a doctor can be confused by such a childish sophism
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PeroK reacted to robphy's post in the thread Undergrad Is calling fictitious forces "not real" just about terminology? with Informative.
Possibly interesting: "Causal reasoning in understanding Newton’s third law" Cheng Chen, Lei Bao, Joseph C. Fritchman, and Hemin Ma...
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PeroK reacted to PeterDonis's post in the thread Undergrad The quintessence as variable dark energy with Like.
"Space" isn't an invariant. It varies in spacetime. Whether that means variation in "space" depends on your choice of coordinates...
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PeroK replied to the thread Impersonation News.A lot of videos on YouTube are fake now. I've seen videos of Barack Obama and Warren Buffet, where I've thought there must be something...
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PeroK reacted to Dale's post in the thread High School Why higher speeds need more power if the backward force is the same? with Like.
Yes, but sometimes there are shortcuts. In the case of running or walking up the stairs, neglecting the initial start and final stop...
