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## #1 2012-01-26 11:24:53

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

### Fermi's questions!!!

hi guys

few days ago i stumbled upon these kinds of problems through the all-mighty Wikipedia.they are very interesting and i thought we should do some here.

me first:
"How much *oxygen* does an average person breathe in with each breath?"

let the games begin!

Last edited by anonimnystefy (2012-01-27 06:14:06)

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #2 2012-01-26 11:30:46

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Fermi's questions!!!

few days ago i stumbled upon these kinds of problems

I wish you would be stumbling over to the problems you asked me for.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #3 2012-01-26 11:33:05

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

### Re: Fermi's questions!!!

why so mean?

it's not my fault.and this forum was partially created for helping those in need.if you don't want to help you don't need to!

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #4 2012-01-26 11:37:32

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Fermi's questions!!!

Who is being mean? You did ask me for tougher problems. Also, you asked me on how to complete the cube. Took me 8 hours to clear up that guys gibberish and you have not even been there. How about the derangement problem? That was a dilly. Took me a whole day. It was a great piece of work too, better than anything Einstein ever did. Not Albert the other Einstein.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #5 2012-01-26 12:22:43

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

### Re: Fermi's questions!!!

I never asked you for derangements,juan did.and i didn't even see the completing the cube text files promised!

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #6 2012-01-26 13:00:54

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Fermi's questions!!!

I never asked you for derangements,juan did.and i didn't even see the completing the cube text files promised!

Both were given to you as promised.

http://www.mathisfunforum.com/viewtopic … 00#p198900

And here is the derangement problem.

http://www.mathisfunforum.com/viewtopic.php?id=17147

Post #1 to #16

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #7 2012-01-27 03:05:28

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Fermi's questions!!!

Now back to the original question.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #8 2012-01-27 03:43:13

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

### Re: Fermi's questions!!!

hi bobbym

the point is to make reasonable assumtions and ask questions like:"What is the capacity of the human lungs?" or something like that.

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #9 2012-01-27 04:18:53

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Fermi's questions!!!

I do not get it but I will copy your question.

What is the capacity of the human lung?

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #10 2012-01-27 05:47:57

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

### Re: Fermi's questions!!!

well,you cannot ask stuff that would directly give you the answer.look up Fermi's questions on wiki.

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

Offline

## #11 2012-01-27 05:52:45

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Fermi's questions!!!

Okay, what is the size of a human lung? That is a Fermi question.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #12 2012-01-27 05:57:41

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

### Re: Fermi's questions!!!

i'm not sure you got it.a Fermi question is what i posted in the first post.what your question is is a question whose answer can help you answer the Fermi question.but your question is valid.

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

Offline

## #13 2012-01-27 06:03:11

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Fermi's questions!!!

Hi;

I got that question from a similar one asked by Sheila's future physisicts.

http://mathforum.org/workshops/sum96/interdisc/sheila2.html#2

See the balloons in a room problem.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #14 2012-01-27 06:13:51

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

### Re: Fermi's questions!!!

hi bobbym

well you can if you need to,but you must be aware if your answer is the one which was asked for.

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

Offline

## #15 2012-01-27 06:17:18

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Fermi's questions!!!

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #16 2012-01-27 06:21:50

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

### Re: Fermi's questions!!!

hi bobbym

it would be nicer if the answer was given in number of molecules.in fact a saw the question again and realized that i haven't posted it quite correctly.

but,even in the form of liters it's not a good answer.you forgot to take in oe detail about the human lungs.

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

Offline

## #17 2012-01-27 06:23:37

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Fermi's questions!!!

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #18 2012-01-27 06:31:55

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

### Re: Fermi's questions!!!

well it is.but is that the value you need?

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

Offline

## #19 2012-01-27 06:41:46

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Fermi's questions!!!

I would say so. Since 1 / 5 of the air is oxygen, 6 / 5 = 1.2 liters is the volume of oxygen in one breath by a human lung.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #20 2012-01-27 07:02:06

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

### Re: Fermi's questions!!!

well then i suggest looking at the wiki article on lung capacity.

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

Offline

## #21 2012-01-27 08:02:11

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Fermi's questions!!!

Molecules! I will go to work on it.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #22 2012-01-27 08:23:42

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

### Re: Fermi's questions!!!

hi bobbym

it's not just about molecules.when we breath we don't use our full lung capacity!

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

Offline

## #23 2012-01-27 10:25:54

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Fermi's questions!!!

Checked Wiki and was unable to find a clear answer on percentage of the lungs used.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #24 2012-01-27 10:58:22

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

### Re: Fermi's questions!!!

hi bobbym

here you are:Tidal volume

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

Offline

## #25 2012-01-27 12:11:30

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Fermi's questions!!!

Hi;

That is giving a weight to volume ratio, I do not know the weight.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline