a = 0.8
2nd term = 0.08
3rd term = 0.008

r = 0.08/0.8
= 0.1

sum to infinity = 0.8/(1-0.1)
= 8/9

there you go http://www.physics4spm.com/

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Added on November 28, 2010, 12:57 pmwhats recurring decimal?

This post has been edited by ariff02: Nov 28 2010, 12:57 PM

It is clear that if 7 is divided by 3, then the 3s in the answer never stop. This is an example of a recurring decimal.

thanks

does that mean recurring decimal cases can only occur in G.P(no A.P) and the solution for this type of question is by finding the sum of infinity?

yea

ha thanks for your help

EDITED

This post has been edited by jyhy: Nov 28 2010, 01:35 PM

what will happen to the speed of sound when density of air increases?

decreases

Yup! You are right! =)
LOL! You are so patriotic huh? hahaha
Are u PM's son or daughter ?

given (a-3)u = (2b+1)v , find the value of a and b,if vector u and v are neither parallel nor zero vector...................

any1 can help??

This post has been edited by ahda: Nov 28 2010, 02:29 PM

nope... im jus a..

malaysian

Why so? I thought sound travels faster in denser mediums. Like sound travels faster in solid than in air. So shouldn't sound travel faster in denser air? Provided there are more molecules for vibration of sound to take place. I'm not sure about this so please correct me if im wrong.

I think you should not link it to the kinetic theory of the matter =D in this case you should see it through the properties of wave....correct me if I am wrong =D

do you have the solution for this d?

No technically it's not about the kinetic theory. It's stated in my book. The spped of sound in solids is greater than speed of sound in liquid / gases.

Sound travels in air at about 330 / water 1400 and solids eg concrete at 5000ms.

density =/= state of an object

yea the answer a=3 , b= -1/2

i mean the steps