wrobel's latest activity

I must apologize, I have just looked through "Surely You're Joking, Mr. Feynman" In this text he definitely says that he learnt this...

Feynman also said that he invented the differentiation of an improper integral to calculate it. He must have worked under the pseudonym...

The composition of a translation and a rotation is written as follows $$\boldsymbol r'=\boldsymbol c+A\boldsymbol r,$$ where ##A## is an...

Nice resource but the problem https://www.feynmanlectures.caltech.edu/info/exercises/rough_inclined_plane.html is spoiled:) Good...

https://en.wikipedia.org/wiki/Stress%E2%80%93strain_curve

Hooke's law, by the way, does not work under large stress when the material is about to break.

Here is an interesting problem (in my opinion at least) A rubber band is placed on a horizontal table and attached to a vertical wall...

looks like a problem about differentiation of a function $$f(t)=\sqrt{a_1^2+a_2^2-2a_1a_2\cos(\omega_1-\omega_2)t}$$

This whole thread rotates around the point that @gen x can't see a mathematical fact about kinematics without using math. I think that...

Eventually understanding is an ability of problem solving and nothing else:)

provide a definition of the notion "a rigid body rotates about a point"

This phrase does not make sense.

I mean that one should first study kinematics and after that dynamics. Any motion is defined with respect to some frame only. So what?

It is a very bad idea to throw kinematics and dynamics in the same heap

I am afraid this notion is not completely formalized. Say a lab frame is an inertial frame you are sitting in and with respect to which...