kilavoud
Posts: 863
Joined: Sun Sep 07, 2003 7:47 pm

Hi, your help will be much appreciated for the two following exercises :

Exercise 1

The mass of an atom of carbon is evaluated to 1,99 x 10 -26 Kg.
Calculate the number of atoms contained in a mg of carbon.

Exercise 2

Calculate the number of atoms contained in a gram of iron, knowing
that the mass of an atom of iron is evaluated to 9,27 x 10 -26 Kg.

- 26 Kg. (- and 26 should be up)

Thank you so much and all the best. Kilavoud.

707CMF
Posts: 4698
Joined: Thu Mar 14, 2002 5:39 pm

Exercice 1 :

1,99 x 10 -26 Kg = 1,99 x 10 -20 mg

N (number of atoms ) = 1/(1,99 x 10 -20) = (roughly) 5.0251 x10 19

Exercice 2 :

9,27 x 10 -26 Kg = 9,27 x 10 -23 g

So N = 1 / (9,27 x 10 -23) = 1,0787 x 10 22

Cheers,

707, bored

777fan
Posts: 2256
Joined: Wed Jan 04, 2006 12:09 pm

Damn.......I am impressed!
DC-8 61/63/71 DC-9-30/50 MD-80/82/83 DC-10-10/30 MD-11 717 721/2 732/3/4/5/G/8/9 741/2/4 752 762/3 777 A306/319/20/33 AT

Superfly
Posts: 37735
Joined: Thu May 11, 2000 8:01 am

777fan:
Amazing!

Dude if I were you, I quit the Insurance Sales Trainer gig and become an engineer! With those skills you can really rake in the bucks!
Bring back the Concorde

Lindy
Posts: 4722
Joined: Wed May 19, 1999 10:42 pm

Kilavoud,

How old is your doughter? I mean what class she's in right now?

Rafal

Superfly
Posts: 37735
Joined: Thu May 11, 2000 8:01 am

Lindy:
This isn't the best way to meet girls and is a bad 1st impression on a father.
Bring back the Concorde

NWA
Posts: 1162
Joined: Fri Jun 22, 2001 2:31 am

She is probably in 11th grade. Thats when i did this stuff. Physics & chem
23 victor, turn right heading 210, maintain 3000 till established, cleared ILS runwy 24.

fspilot747
Posts: 3455
Joined: Mon Nov 01, 1999 2:58 am

Yeah sounds like 10th or 11th grade when I did physics and chem too. It's just formulas..plug and chug.

FSP

777fan
Posts: 2256
Joined: Wed Jan 04, 2006 12:09 pm

God, I cannot remember any of that stuff!

No Thanks Superfly! I'll keep my day job!
DC-8 61/63/71 DC-9-30/50 MD-80/82/83 DC-10-10/30 MD-11 717 721/2 732/3/4/5/G/8/9 741/2/4 752 762/3 777 A306/319/20/33 AT

Lindy
Posts: 4722
Joined: Wed May 19, 1999 10:42 pm

I asked what grade she was in because after 707cmf did the math some of you said WOW you should be an engineer hehehe This is only 10/11th grade math.

Rafal

707CMF
Posts: 4698
Joined: Thu Mar 14, 2002 5:39 pm

Well, a tad of math/physics currency is usefull when you are a pilot...

707

kilavoud
Posts: 863
Joined: Sun Sep 07, 2003 7:47 pm

Hi 707cmf - Thank you very much for your nice help.

Hi Lindy - My daughter is 13 years old and she is in the 4th grade of the Lycée Français of Pondicherry (southern India) a French School, under French Administration with the same teaching, material and staff as in France, with about 1,200 students, mostly Indians and Indian-born French citizens. Both my daughters (13 + 7), my wife and myself are Swiss citizens. Pondicherry was a French colony up to 1956, and after it has been surrendered to India, it has still kept a French town hall, school, etc. It is a nice place to live, with big and nice beaches, in a tropical area at the Bay of Bengal..

As I do not know to which grade the French 4th grade corresponds in the States, I give you below some details regarding the French School , which may help you :

Age from 03 to 04 - Maternelle, petite section (Nursery school- little course)
Age from 04 to 05 - Maternelle, moyenne section (Nursery school- middle course)
Age from 05 to 06 - Maternelle, petite section (nursery school- high course)
Age from 06 to 07 – CP - Cours préparatoire (Preliminary class)
Age from 07 to 08 - CE1 – Cours élémentaire 1 ( Basic 1)
Age from 08 to 09 – CE2 – Cours élémentaire 2 ( Basic 2)
Age from 09 to 10 - CM1 – Cours Moyen 1 (Middle 1)
Age from 10 to 11 - CM2 – Cours Moyen 2 (Middle 2)

(From Age 11 to Age 17, the grades are counted down)
Age from 11 to 12 – 6ème ( 6th grade)
Age from 12 to 13 – 5ème ( 5th grade)
Age from 13 to 14 – 4ème ( 4th grade)
Age from 14 to 15 – 3ème ( 3rd grade)
Age from 15 to 16 – 2ème ( 2nd grade)
Age from 16 to 17 – 1ère ( 1st grade)

Age from 17 to 18 - terminale (final year)
Age from 18 to 19 - baccalauréat (high school diploma)
Age from 19 to ?? - start university

When my daughters will be 19 years old, they will have the possibility to continue their studies at the University of Lausanne, my native place located at the Geneva Lake, in the French speaking part of Switzerland, or to do it in English in India or elsewhere.

For family reasons I live myself in India in February, April, June, August, October, December and for professional reasons in Switzerland the six other months of the year. As we have a house in India and an apartment in Switzerland, I feel in both places at home. I appreciate to change every month of climate and culture, and to have one place for my family life and another place for my working life.
And to have to work only 6 months on 12 a year is just great. I enjoy both my family life in India and my colleagues from work in Switzerland and this way of living alternately is never boring. Every year I fly 2 times with LH GVA-FRA-MAA(Madras)-FRA-GVA and 4 times with SQ ZRH-SIN-MAA-SIN-ZRH and let me tell you that it is fantastic to stopover in Singapore and discover other cultures, like Chinese and Malay cultures.

When I will be retired I like to come for some holiday in the States with ma family.

All the best. Kilavoud.

707CMF
Posts: 4698
Joined: Thu Mar 14, 2002 5:39 pm

You're welcome

However, just to correct what you said right above :
you have (and hopefully pass) the baccalaureat at the end of the terminale year, and usually start university right after (i.e. at 18)

707, Bachelier de 1994 (Bac C)

airsicknessbag
Posts: 4626
Joined: Thu Aug 17, 2000 2:45 am

Hello? This has NOTHING to do with physics/chemistry.

It´s a simple division by 1,000,000 in the first case, and by 1000 in the second case.

1.99 x (10 indexed -26) divided by 1,000,000 equals 1.99 x (10 indexed -32)

9.27 x (10 indexed -26) divided by 1000 equals = 9.27 x (10 indexed -29)

Just subtract six/three zeroes, i.e. decrease the exponent by six/three.

Sorry 707cmf, you have it backwards: by incresing the exponent, you multiplied instead of dividing.

Daniel

kilavoud
Posts: 863
Joined: Sun Sep 07, 2003 7:47 pm

707cmf , I have done myself my studies in Switzerland with other grades but for my daughter I tink your information is right and I will check again.

Where is Elbonia, is it Albania ?

Cheers! Kiavoud.

kilavoud
Posts: 863
Joined: Sun Sep 07, 2003 7:47 pm

707cmf , I have done myself my studies in Switzerland with other grades but for my daughter I think your information is right and I will check again.

Cheers! Kilavoud.

707CMF
Posts: 4698
Joined: Thu Mar 14, 2002 5:39 pm

Sorry 707cmf, you have it backwards: by incresing the exponent, you multiplied instead of dividing.

I am afraid your calculations are erroneous...

The question is "how many atoms per gram ?" (or milligram). Logic tells that the answer will be "a lot", while your answer (1.99 x (10 indexed -32)) is "very few".

707

707CMF
Posts: 4698
Joined: Thu Mar 14, 2002 5:39 pm

Where is Elbonia, is it Albania ?

Please, no, not that question again...

Elbonia is a Presipaute (like Grosland) situated not far from Noudinlesnoyeaux.

707

airsicknessbag
Posts: 4626
Joined: Thu Aug 17, 2000 2:45 am

You´re right, 707cmf. I misread the question.

(But it still is a rather easy task: two equations with one unknown X - once one has stripped it off the atoms frills and stuff).

Daniel

kilavoud
Posts: 863
Joined: Sun Sep 07, 2003 7:47 pm

Thanks Airsicknessbag, now that everything has been put in in order, I better understand the answer to the problem.

Excuse me 707 cmf for my asking about Elbonia, in fact it was by error that I have sent my reply including that question.

Without a doubt I will have to revise myself my maths to better come to my daugther's help in future.

Cheers. Kilavoud.

galaxy5
Posts: 1952
Joined: Sat Mar 18, 2000 10:09 pm

Here's an easy one for you:

If it was 30 degrees (F) out yesterday and it's twice as cold today, what's the temperature?
"damn, I didnt know prince could Ball like that" - Charlie Murphy

kilavoud
Posts: 863
Joined: Sun Sep 07, 2003 7:47 pm

Hi Galaxy5

As simple as this :

30 degrees F = -1,111 degreesC
-1,111 degrees C x 2 = -2,222 degrees C
-2,222 degrees C = 28 degrees F

The answer is 28 degrees F

Cheers. Kilavoud.

707CMF
Posts: 4698
Joined: Thu Mar 14, 2002 5:39 pm

You´re right, 707cmf. I misread the question.

(But it still is a rather easy task: two equations with one unknown X - once one has stripped it off the atoms frills and stuff).

Well, I never said it was difficult
It is actually exactly as if we were asked "a plane flies at 800km/h, and the flight duration is 2h30minuts, what is the distance ?"

If it was 30 degrees (F) out yesterday and it's twice as cold today, what's the temperature?

Ah, the temperature problem. I would use Kelvin.. 30 deg F = 272K -> today is 136K = -214 F...

707

777236ER
Posts: 12213
Joined: Sat Aug 18, 2001 7:10 am

God, bloody Europeans. Trust them to cock it up and make a Brit get the right answer.

30 deg F = 489.67 Rankine.
Today is 244.84 Rankine = -214.83 deg F.

Brrr...
Your bone's got a little machine

707CMF
Posts: 4698
Joined: Thu Mar 14, 2002 5:39 pm

Well, also I'd have preffered a 7772B3-ER... we seem to agree together !

707

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