I agree!
What we have here with the pulleys is a complex equation to describe the geometry correctly.
Using Valery's simplification with r=0 makes sense but only in this case (reality has r>0 additional to this we have very large friction at the fixing points if r=0)
Because of pictures are good, i will add this (created with CAD-System):
The initial configuration of the three-mass system, chosen by me, is as follows:
but it is very laborious... I'm studying the case where the angle θ is much less than a radiant.
A "block and tackle," refers to an arrangement of ropes and pulleys that develops mechanical advantage:
A "pulley," is one spinning part of that. What your sketches illustrate 
Are (more accurately) two pulleys. A single pulley develops no mechanical advantage.
Fred Kohlhepp написал(а):
A "block and tackle," refers to an arrangement of ropes and pulleys that develops mechanical advantage:
A "pulley," is one spinning part of that. What your sketches illustrate
Are (more accurately) two pulleys. A single pulley develops no mechanical advantage.
... and here too? With big friction!
... but would not it be more fun to see this system as it behaves?
There are a spring, four masses two discs....
F.M. написал(а):
Beautiful, .... but the woman ... the one of the photo, is even more ...
Yes - woman is woman! But I can create and add new frames and do animation more fine:
I use my iron assistant for this manual work:
F.M. написал(а):
Beautiful, .... but the woman ... the one of the photo, is even more ...
Woman and Flowers!
You can change L, masses, start point and get new woman, flowers etc!
F.M. написал(а):
Beautiful, .... but the woman ... the one of the photo, is even more ...
One part of a women - a Russian big woman 
F.M. написал(а):
....... this is the bust of a woman with swollen belly and older age .... we are interested in those with age <50 ...
If you want to make me laugh you did not succeed ...
There are also good and bad taste responses .... The exhibit these women is certainly something in bad taste, in my opinion. We must also be alert to the sensitivity of the people to whom we respond, bearing in mind that we are in the presence of an extensive audience.
If you want to make me laugh you did not succeed ...
There are also good and bad taste responses .... The exhibit these women is certainly something in bad taste, in my opinion. We must also be alert to the sensitivity of the people to whom we respond, bearing in mind that we are in the presence of an extensive audience.
Anyway ...I hope the audience finds very interesting, the background of the photo ... on the left .... Sorrento a few hours ago ...
I have in my book Физико-математические этюды с Mathcad и Интернет
one example with a boot - one part in water - one part in air
F.M. написал(а):
Beautiful, .... but the woman ... the one of the photo, is even more ...
It was a first world "woman" in this branch of this Community Forum. And not me have said it!
F.M. написал(а):
Hello, in attached you find a simple animation .avi.
We can open here the MOV animation not AVI:
It is not about women!
PS Convertor AVI to MOV Online converter - convert video, images, audio and documents for free
