Interesting and Humour - page 2695

[khorosh]

Александр:
Well, you didn't let people have a good time.

The two of them will pull the boat faster anyway, because one of them will be more exhausted than the other. And when there are two of them, they can take turns pulling (each of them can take a rest break from time to time). It's just easier to hold the rope than to move it with your hands.

[[Deleted]]

Pavel Gotkevitch:

Puzzling mechanics - Perelman Ya.

http://www.booksshare.net/index.php?id1=4&category=mechanics&author=pereliman-ya-i&book=1933&page=7

and still... the first one is faster... because there's no synchronicity =) and the sailor will fall off the pier =)

[[Deleted]]

khorosh:
The boat will be pulled faster by two people anyway, because one of them will be exhausted faster. And when there are two of them, they can take turns pulling (each of them can take an occasional break to rest). It's just easier to hold the rope than to move it with your hands.

And by the way, I think Perelman, too, if he was fishing, it was only from the shore.

[Pavel Gotkevitch]

Generally speaking, in Ya. I. Perelman's condition is not quite correct - "...All three make equal efforts". Not a word about synchronism, which clearly implies non-simultaneous mooring.

So in this case respected Yakov Isidorovich is a bit wrong.

And Alexander has clearly grasped this point and added the condition of synchronism, for which he is commended.

[Dmitry Fedoseev]

Pavel Gotkevitch:
Generally speaking, in Ya. I. Perelman's condition is not quite correct - "...All three make equal efforts". Not a word about synchronism, which clearly implies non-simultaneous mooring.

So in this case respected Yakov Isidorovich is a bit wrong.

Alexander has clearly grasped this point and added a condition for synchronism, for which he is commended.

They cannot be out of sync. You can't get away from Newton's third law of motion. What the force at one end of the rope is equal to is equal to the force at the other end of the rope.

[sibirqk]

If the tension is the same the boats will come ashore at the same time, just in the case of two 'pullers' each will do half as much work as the one pulling alone.

[Vitalie Postolache]

Dmitry Fedoseev:
They can't be out of sync. You can't escape Newton's third law of motion. What the force at one end of the rope is equal to is equal to the force at the other end of the rope.

If it's not terminators, but living people, most of the work will go into tugging back and forth, precisely because of the inability to synchronise the process precisely. You can bang on the drums like a galleys, they're still going to be asynchronous.

The first one starts to pull, and firstly he picks up the slack in the rope, which is created by rearrangement of arms, then, when the rope is tight, the second one's muscles are not tense enough, and the first one, instead of pulling himself to the bank, pulls the second one towards himself. This cannot be avoided, which means some of the work is wasted.

[Dmitry Fedoseev]

Vitalie Postolache:

If they're not terminators, but live humans, most of the work will go into tugging back and forth, precisely because of the inability to precisely synchronise the process. You can beat the drums like a galleys, they'll still work asynchronously.

The first one starts to pull and firstly he picks up the slack in the rope. Then, when the rope is tightened, the second one's muscles are not tense enough and instead of pulling himself, the first one pulls the second one towards himself. This cannot be avoided, which means some of the work is wasted.

Ahahahaha... Have you ever lifted anything heavier than a fountain pen?

Also, bread grows on trees.

[Vitalie Postolache]

Dmitry Fedoseev:

Ahahahaha... Have you ever lifted anything heavier than a fountain pen?

Also, bread grows on trees.

What fountain pen, I take the lead out of a pencil and write with it. It's too heavy to lift a fountain pen together with a piece of wood ))))

[Andrey Sharov]

Chinese authorities suspect robot in stock market crash

http://lenta.ru/news/2015/07/14/chinasoftware/