« previous next »
Pages: 1 ... 19 20 [21] 22 23 ... 25   Go Down

Author Topic: Maths & Physics Help  (Read 53396 times)

Offline love

  • Newbie
  • *
  • Posts: 23
  • Reputation: 28
Re: Maths & Physics Help
« Reply #300 on: May 10, 2009, 08:30:10 am »
hehe....  even i dont noe...but log is not in our x ig syllabus y r ppl using log den
log is not taught to u man!!!!
Logged

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: Maths & Physics Help
« Reply #301 on: May 10, 2009, 08:31:50 am »
No if we had f(x))=x2 then f-1(x)=\sqrt(x)

Log is totally different.

I am surprised it is in igcse
Does your calculator has a solve or calc button?
Logged

Offline godfather93

  • SF Senior Citizen
  • *****
  • Posts: 720
  • Reputation: 799
  • Gender: Male
  • Tomorrow is a day that changes everyday
Re: Maths & Physics Help
« Reply #302 on: May 10, 2009, 08:34:36 am »
my calculator only has the log button. Bt what is it?
Logged

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: Maths & Physics Help
« Reply #303 on: May 10, 2009, 08:35:52 am »
Log is like asking if 5=10x what is x? It is log105/log1010 or ln5/ln10
« Last Edit: May 10, 2009, 08:37:54 am by astarmathsandphysics »
Logged

Offline love

  • Newbie
  • *
  • Posts: 23
  • Reputation: 28
Re: Maths & Physics Help
« Reply #304 on: May 10, 2009, 08:37:43 am »
arey but log question aint gone cm in past papers to no log question is deir because i hve solved ALL past papers
n our teacher asked us not use log


ok fi9 by d way tell whts LOG???
Logged

Offline godfather93

  • SF Senior Citizen
  • *****
  • Posts: 720
  • Reputation: 799
  • Gender: Male
  • Tomorrow is a day that changes everyday
Re: Maths & Physics Help
« Reply #305 on: May 10, 2009, 08:38:29 am »
thank you so much! I never knew that. That will be extremely useful during the exam.
Logged

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: Maths & Physics Help
« Reply #306 on: May 10, 2009, 08:41:01 am »
You need logs when you are dealing with exponential rates of growth or decay- when something is doubling or halving every hour for example. N=50*10t and you need to find t for certain N
Logged

Offline love

  • Newbie
  • *
  • Posts: 23
  • Reputation: 28
Re: Maths & Physics Help
« Reply #307 on: May 10, 2009, 08:41:24 am »
Quote from: astarmathsandphysics on May 10, 2009, 08:35:52 am
Log is like asking if 5=10x what is x? It is log105/log1010 or ln5/ln10


ok thx dear...
Logged

Offline SGVaibhav

  • SF Farseer
  • *******
  • Posts: 3013
  • Reputation: 5737
  • Gender: Male
  • Bugatti Veyron 16.4
Re: Maths & Physics Help
« Reply #308 on: May 10, 2009, 09:11:45 am »
ANNOUNCEMENT

THIS IS THERE IN THE SYLLABUS

UR SHOCKED RIGHT!!!












IT IS THERE IN ADDITIONAL MATHEMATICS SYLLABUS
Logged

Offline emi

  • SF Geek
  • ****
  • Posts: 530
  • Reputation: 2581
  • former member
Re: Maths & Physics Help
« Reply #309 on: May 10, 2009, 10:12:09 am »
astar can u tell me a little more about log ?? or solve a Question about it ??...
can u solve this one by log ?

(a) Simplify (27x6)1/3


(b) (512)-2/3 = 2p

. Find p.
Logged
former member

Offline Zain-Xa

  • SF Overlord
  • *********
  • Posts: 11833
  • Reputation: 10822
  • I got an "I <3 ?" written at the back of my hand
Re: Maths & Physics Help
« Reply #310 on: May 10, 2009, 10:21:59 am »
thats not a log question

for e.g 2=5^x then u can use log

x = log2/log5
Logged
What can I do, to make it right
Falling so hard so fast this time
What did I say, what did you do?
How did I fall in love with you?


zzzzzZZZZZZzzzzzzzzz

I'll be strong.. I'll be wrong.. all the love goes on.. Oh im just a girl tryna find a place in this worLD..  Taylor swift <3

Offline Zain-Xa

  • SF Overlord
  • *********
  • Posts: 11833
  • Reputation: 10822
  • I got an "I <3 ?" written at the back of my hand
Re: Maths & Physics Help
« Reply #311 on: May 10, 2009, 10:23:32 am »
but the second one is....

log log(512)^-2/3 / log 2
Logged
What can I do, to make it right
Falling so hard so fast this time
What did I say, what did you do?
How did I fall in love with you?


zzzzzZZZZZZzzzzzzzzz

I'll be strong.. I'll be wrong.. all the love goes on.. Oh im just a girl tryna find a place in this worLD..  Taylor swift <3

Offline SGVaibhav

  • SF Farseer
  • *******
  • Posts: 3013
  • Reputation: 5737
  • Gender: Male
  • Bugatti Veyron 16.4
Re: Maths & Physics Help
« Reply #312 on: May 10, 2009, 11:27:23 am »
nah
i dont know all this log
Logged

Offline Christy

  • SF Citizen
  • ***
  • Posts: 145
  • Reputation: 2
Re: Maths & Physics Help
« Reply #313 on: May 10, 2009, 11:32:28 am »
WOW ... thats amazing :D

u shudve seen my face wen i new about this  :P
Logged

Offline emi

  • SF Geek
  • ****
  • Posts: 530
  • Reputation: 2581
  • former member
Re: Maths & Physics Help
« Reply #314 on: May 10, 2009, 06:13:04 pm »
please if any one could tell me how to do
m/j 2003 paper 6 physics Q4 part a ii)  and b  .... please im waiting
Logged
former member
Pages: 1 ... 19 20 [21] 22 23 ... 25   Go Up
« previous next »