Question

The speed of sound in the air is proportional to the square root of the
absolute temperature. At 20 °C the speed of sound is 343 m/s. What is the
speed of sound at –10 °C? (0 °C = 273 K).

Answer 1

please, help

Answer 2

v=343*sqrt(263/293)

Answer 3

since they are proportional , then you'll have this:\[\left| T \right|/ speed \]

so in this case:

\[343/20 = \left| 10 \right|/ \]

solve for S by cross multiplying and that's it ^_^

Answer 4

343/20 = 10/S *

Answer 5

correct me if I'm wrong :)

Answer 6

the result is 324.966 m/s

Answer 7

i am thank you, leofy am very very fankful, sstarica is very good know alot than leofy, i thank you

Answer 8

soory for me enlish, i am from iran

Answer 9

most welcome ^_^, no it's okay, as long as we understand you then your english is perfect!

Answer 10

i father is has money, so he is working a chemist for a organisation, he teach me how to make boom, and like i like it

Answer 11

that's awesome, try not to create a nuclear bomb ^^" :D

Answer 12

he tels me to learn this english maths and these english books, he say it is good in future

Answer 13

no, i make asltrolite G

Answer 14

Astrolite G

Answer 15

yes, he's right :) good luck leofy!

Answer 16

thankyou, i am very happy that you help me iraq people, because i know amerikans dont like iraq people, my teacher told me in sckool

Answer 17

let s be the speed of light, and T the absolute temperature, then we have:
s=k(sqrt(T)), where k is some constant
we can find k: k=s/(sqrt(T)) => k=343/(20+273)=1.17
hence, the speed of air at -10°C is s=1.17(-10+273)=307.7m/s
hopefully I am right :)

Answer 18

oh there is a mistake :(
k=343/sqrt(20+273)=20.04
therefor s=20.04*sqrt(-10+273)=324.97m/s :)

Answer 19

hmmm, why complicate it? T and S are both proportional to each other :)

Answer 20

it doesn't matter what is k because it is constant and after simplifying it get omited.so
let v' be new speed.v'/v=sqrt(T'/T) where T' is new temprture in kelvin. so the last result for v' is 324.966 m/s

Answer 21

it feels much better when it's more complicated, don't you agree? :)

Answer 22

guys guys, they are proportional why don't you just write down the following relationship:

T1/ S1 = T2/S2

simple as that ^_^

Answer 23

if you can't explain it in a simpler way , then you yourself don't understand it- Albert Einstein ^_^

Answer 24

wow this is a good one for Albert Einstein, although I don't agree totally with him :P

Answer 25

you should, the simpler you explain it , the clearer you see the problem and the clearer the other person sees it too + the more organized.

To solve a problem, we take each step at a time = this is called organization = simplicity
:)

Answer 26

haha ok ok I agree

Answer 27

:) how great it is to find a simple solution for a complicated problem. This is life ^_^

Answer 28

:)

Answer 29

I think there is one little mistake in the formula you gave, that you consider S to be proportional to T, while it's proportional to its square. right?

Answer 30

square root*

Answer 31

true! I forgot abt it ^_^ so it'll be :\[\sqrt{T1}/\S1 =\sqrt{T2}/\S2\] ofcourse the absolute of both temperatures :)

Answer 32

sqrt|T1|/S1 = sqrt|T2|/S2

^_^

Answer 33

thank you anwar :)

Answer 34

today is hapy day for my, my father tell my i can go to my one training for fightrs

Answer 35

yay, have fun! ^_^

Answer 36

loll.. today is my worst day.. just saying not like it would matter :)
anyways, good for you leofy, go beat the crap out of them :P

Answer 37

leofy, you are from iraq and specifyed something about your father teaching you to make bombs, and in particular, ASTROLITE G!!! I have an idea that you ARE terrorist (at least your father is)

Answer 38

we dont need terrorists here

Answer 39

lol.. you are so logical :P

Answer 40

oh come on, he's doing that for the love of science angoo :)

no need to call him that, that's mean

Answer 41

you know it's sarcasm right? :P

Answer 42

i dunno, is it? .-.

Answer 43

no, i googled up astrolite G, and my dear friend, that is NOT a science type of boom!
see for your self

Answer 44

lol my reply was

Answer 45

http://en.wikipedia.org/wiki/Astrolite

Answer 46

well maybe it's used as some sort of weaponary tool for his country?

Answer 47

damn, half a glass of this stuff is enough to blow up a tank!!!

Answer 48

AND,millitary does not use it, because it is too dangerous

Answer 49

http://en.wikipedia.org/wiki/Astrolite see for yourself!

I am telling you this is a terrorist kid!!!

Answer 50

c'mon, I would not even bother myself to check.. it's just your thoughts being effected and controlled by the media

Answer 51

see, that's the beauty of science in the field of chemistry ^_^

Answer 52

maybe they are just discovering new things or trying to create new things, you never know ?

Answer 53

ok, whatever, but if he learns maths and uses it to build bombs that will be used by suicide terrorists... I wash my hands

Answer 54

you're saying the beauty of science in everything sstarica.. and this is the beauty of being a scientist :)

Answer 55

oh come on, don't be s negatively charged angoo! I must feed you a dozen of protons to get you positive .

He's just learning and he sounds like a nice guy. Maybe he's just trying out different things

Answer 56

so*

Answer 57

ok you wash your hands.. we will not hold you any responsibility about it. but make sure not to help him solve any problem

Answer 58

lol, come on. Have faith in ppl ^_^

Answer 59

how can you possibly trust yourselves without trusting one another?

Answer 60

hmm....ok, ok, sorry for being too harsh, i am sorry Leofy if you are reading this

Answer 61

^_^

Answer 62

are you serious "BecomeMyFan" btw? because if you're, I will never be a fan of yours. (angry face)

Answer 63

anwar >_>

Answer 64

i was just sarcastic and messing around =D LOL

Answer 65

LOL just kidding guys.. this argument really helped me change the mood I was in.

Answer 66

you sounded serious angoo ^^"....and you've made me open my big mouth

Answer 67

._. *dumbfounded*

Answer 68

^^"

Answer 69

you deserve an oscar then :P

Answer 70

ahahaha... ^^" seriously.

Answer 71

well, i am practising, because i want to be good at social hacking, so i gotta practice on ppl to manipulate their emotions and make them believe what i want them believe :)

Answer 72

you haven't manipulated MY emotions >_>

Answer 73

lol.. you know that you failed, right? :P

Answer 74

http://en.wikipedia.org/wiki/Social_engineering_%28security%29

Answer 75

yes, i am just starting out

Answer 76

._. good luck?

Answer 77

oh, and btw, Leofy is a fictionary character that I created

Answer 78

hahah I am good at it. I can help you get better

Answer 79

w...what >_>

Answer 80

wes, you heard me right

Answer 81

I feel like jumping out of a window right now

Answer 82

we give you a face (you will never know what that means).

Answer 83

gave*

Answer 84

we did?

Answer 85

yes

Answer 86

._. ...

Answer 87

didn't you?

Answer 88

^^"...don't remember

Answer 89

so, was i good at being Leofy, did he sound sincear, real?

Answer 90

lol

Answer 91

no

Answer 92

he sounded so innocent >_<

Answer 93

yeah

Answer 94

=D

Answer 95

anyways, gotta finish chapter 4 in data communications

adios~ ^_^

Answer 96

guys, lets start a social engineering study group

Answer 97

he is so kind.. I believe he is reading what we are writing right now and he's like "what the hell is going on? :O"

Answer 98

good luck sstarica :)