wrobel's latest activity
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wrobel replied to the thread Why can I neglect angular momentum due to precession here?.From the formulas above we can deduce the following remark. Assume that ##R=0## then $$|\Omega|\sim... -
wrobel replied to the thread Why can I neglect angular momentum due to precession here?.Let ##\alpha## be an angle between coin's plane and the floor. The radius of the coin is ##r##. Introduce a moving coordinate frame...
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wrobel replied to the thread I Derivation of Hamilton's Principle: Questions.Sure. Because a definition of ##\delta\boldsymbol {\dot r}_i## is missing.
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wrobel replied to the thread I Derivation of Hamilton's Principle: Questions.$$L=L(t,x,\dot x);\quad\frac{d}{ds}\Big|_{s=0}\int_{t_1}^{t_2}L\big(t,x(t)+s\xi(t),\dot x(t)+s\dot \xi(t)\big)dt$$...
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wrobel replied to the thread I Derivation of Hamilton's Principle: Questions.to get to the Hamilton Principle from what? The standard scheme is as follows. (the Lagrange-D'Alambert principle+certain assumptions)...
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wrobel replied to the thread I Derivation of Hamilton's Principle: Questions.Formula (4) from the article merely does not make sense. Indeed, in the text above ##\delta\boldsymbol {r}_i## stands for virtual...
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wrobel replied to the thread I Derivation of Hamilton's Principle: Questions.Paul Appell: Traité de mécanique rationnelle vol 1,2 Greenwood D.T. Classical dynamics Jorge V. José, Eugene J. Saletan Classical...
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wrobel replied to the thread I Derivation of Hamilton's Principle: Questions.
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wrobel replied to the thread Variable mass system : water sprayed into a moving container.erobz: catch it
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wrobel replied to the thread Variable mass system : water sprayed into a moving container.Yes and that is a proper argument: an article but nobody knows how to marry this argument with results of very informal speculations...
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wrobel replied to the thread I Derivation of Hamilton's Principle: Questions.No it is just a part of some little-known text
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wrobel replied to the thread Variable mass system : water sprayed into a moving container.UPD
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wrobel posted the thread A remark on problem about trajectory of a projectile in the atmosphere in General Discussion.This is just to share some teaching experience. A problem about trajectory of a projectile in the atmosphere is very well known. The...
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wrobel replied to the thread I To predict the nature of Normal Reaction in any mechanics set-up.It looks like a question about reactions of ideal constraints. If it is so then yes reactions of the ideal constraints are calculated...
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15 Year Old Emma Kok Sings I have a question: Is this ok? Is this ok indeed?
