[Archive!] Pure mathematics, physics, chemistry, etc.: brain-training problems not related to trade in any way - page 270

[Sceptic Philozoff]

Whether or not it does depends on how the group operations on the units of information are introduced.

Groups, not semigroups?

[richie]

I decided to add one of my students' problems, for the sake of cleverness. Out of a group of students (12 in total, 10 ladies), only two students (or rather, female students) were able to solve it correctly. The specialty of the group was not physical, but technical.

So: there are six identical batteries, each giving voltage of exactly 1.5 volts. They are connected in series, plus to minus, in a circular circuit:

-

-

Question: What voltage does the voltmeter show?

[михаил потапыч]

4.5

[richie]

Mischek писал(а) >>
4.5

I'll give you an answer tomorrow. I'm going to bed.

[vegetate]

3v

[Parabellum]

And if you redraw it like this:

you get three volts.

[михаил потапыч]

Parabellum >>:

А если перерисовать это так:

то получается три вольта.

and 6 on exactly the same grounds )

[Parabellum]

On the other hand, if you draw it like this:

then six.....

[[Deleted]]

Where is the "+" and "-" -- does it really matter?

It's just that you can see the tips on the batteries.

[михаил потапыч]

Swetten >>:

А где "+" и "-" -- сильно важно?

Просто на батарейках пипки видны.

short - minus

never mind