wrobel's latest activity
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wrobel replied to the thread Variable mass system : water sprayed into a moving container. -
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?
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wrobel replied to the thread Acceleration of a wedge: What forces act on the wedge?.
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wrobel replied to the thread B Average velocity as a weighted mean.I did not say that. Eventually this story is about definitions
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wrobel replied to the thread B Average velocity as a weighted mean.I would say that average of a velocity on the time interval ##[t_1,t_2]## is equal to ##\frac{1}{t_2-t_1}\int_{t_1}^{t_2}\boldsymbol...
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Energy is quite an ambiguous topic in physics. Considering this, I have been trying to get a formal definition for what work done really...
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wrobel replied to the thread A cylinder connected to a hanging mass.the tangent component of the acceleration of a point on the edge
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wrobel replied to the thread Atwood's with a cylinder - Rotational Motion.I like David Morin. 8.27 is good for Lagrange equations.
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wrobel replied to the thread A cylinder connected to a hanging mass.You are said that the system moves so the friction force##=\mu N## "system's acceleration" is an unclear phrase by the way. A point can...
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wrobel replied to the thread B Beam on an inclined plane.https://en.wikipedia.org/wiki/Statically_indeterminate
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wrobel replied to the thread A How does time derivative commute from one variable to another?.In order for simplicity sake some authors make the narration harder. By definition the kinetic energy of a particle is...
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wrobel replied to the thread Motion in 2 dimensions.The point of JimWhoKnew can be illustrated by the following simple analogy. Consider an initial value problem ##\dot x^2+x^2=1,\quad...
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Since this problem came about as an off topic, I feel uncomfortable to hijack the thread. Even more so when the OP places a picture of a...
