Official EK Science(Vidya) thread

[gceal]

In this thread you can talk about scientific things. If you are a student you can ask about past papers from the members in EK. You can post new science inventions take place in this world. If you have problems and questions about science lessons you can post them here and you can solve them easily. I hope all the members will support this thread by there scientific knowledge !

 

[Kalindugayan]

Nice thread
apith science thamai kare ( habai nama ta witharai )

 

[windows8]

ela
mamath science kare bokkenma karala campus giya ( namata newei )

 

[gceal]

ela
mamath science kare bokkenma karala campus giya ( namata newei )

Your welcome to post some scientific explanations !

 

[gceal]

Nice thread
apith science thamai kare ( habai nama ta witharai )

If you do science your mind will develop than others.So you can help this as you can !

 

[gceal]

Some times we were warned not to stand too close to the train track or do you know how a window close suddenly by the wind ? Not only this incidents but also there are lot of incidents similar to this. So what is the principle behind this situations ?

 

[gceal]

Some times we were warned not to stand too close to the train track or do you know how a window close suddenly by the wind ? Not only this incidents but also there are lot of incidents similar to this. So what is the principle behind this situations ?

This can explain by using Bernoulli's principle

"In fluid dynamics, Bernoulli's principle states that for an inviscid flow, an increase in the speed of the fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy"(wikipedia)

When we stay close to the railway track, when the trains passes us at a glance (very fast) the air surrounding to us travels fast as the train. So according to the Bernoulli's principle the air pressure decrease.So there is a pressure difference between the man and his surrounding. From the pressure difference a force creates. By that force man can get attached to the train.

 

[nagaya]

Repost

http://www.elakiri.com/forum/showthread.php?t=588439

 

[gceal]

Some times we were warned not to stand too close to the train track or do you know how a window close suddenly by the wind ? Not only this incidents but also there are lot of incidents similar to this. So what is the principle behind this situations ?

according to the Bernoulli's principle when a winds travels through a window the air speed increases. So the pressure decrease. A force lift up to the window and it suddenly close

 

[gceal]

Repost

http://www.elakiri.com/forum/showthread.php?t=588439

Sorry brother, I didn't see it.

 

[sandun_kg]

Nice thread..

 

[gceal]

Nice thread..

thanks .

 

[gceal]

So few months to the O/L 2010 exam. I decided to upload some science papers regarding to the previous years.

Just look at the question and the answer. Study the notes like that. No you don't have enough time to study all the notes from the beginning to the end.

just look at the question if you cant remember the answer study that part

 

[gceal]

G.C.E O/L 2009- Science MCQ paper

G.C.E O/L 2009- Science MCQ paper

* G.C.E O/L 2009- Science MCQ paper is now available in this site. You can download it form the following link . Click here to download.

* The answers for this mcq paper upload as soon as possible.

 

[Nivinda]

ela machan
+rep

 

[TakurZ]

http://www.elakiri.com/forum/showthread.php?t=588439
අනූ මල්ලියත් ඔයවගේ වැඩක් කරනව මගෙහිතේ

 

[gceal]

http://www.elakiri.com/forum/showthread.php?t=588439
අනූ මල්ලියත් ඔයවගේ වැඩක් කරනව මගෙහිතේ

Is he uploading past papers?

 

[maduranga_it]

yap nice ...ready to do it!

 

[gceal]

yap nice ...ready to do it!

thanks.

 

[TakurZ]

Is he uploading past papers?

I don't think so