Magnifying glass

How does a matchstick light up by using a magnifying glass?

Wikipedia's scientist version:
The sun emits a particle known as a photon.
It carries visible light to earth.
These photons contain energy, which radiate in the form of heat.
When you put a magnifying glass in the paths of these photons,
the convex lense of glass narrows and focuses the photons,
making them converge on a narrower point then if the lense wasn't there.
This concentration of photons concentrates the heat that they emit,
heating the matchstick up until it ignites at a certain temperature (about 451 degrees F).

Kimberly' simplified version:
The sun emits photons.
which carries light and contains heat energy.


When the magnifying lense gets in the way of the photons,
the convex lense of glass narrows and focuses the photons.

All the focused heat energy causes the object to catch fire.


and,
VOILA!
you got fire (:

It's amazing how scientists find out stuff like this isn't it?



Credits:
Wikipedia
drawing-DONE BY ME!

Physics assignment

Let's get started (:

1)How many images would you get for an object that is placed between two mirrors placed at an angle less than 90(degrees)?

I could not really find good pictures on the internet.
So i tried it out myself.



As you can see,
It turns out that the smaller the angle,
The more images the mirror would produce.
For example, If I were to make the mirrors closer together,
More 'kim!'s will be reflected.

It's like how more people(object) would go to the shop that has more discounts(angle) (:


2) What happens to the images of this angle if it is bigger than 90(degrees)?



Just like the picture above,
The bigger the angle, the lesser the 'kim!'s.
As for my own experiment,
I did not get more then 4 reflected images if the angle was over 90degrees.

You might think I'm going to add a catchy phrase here.
But I'm not going to.
Because I can't think of anything.

3) How do mirrors produce funny images?



A slight curve along only one axis can make a person look fat or skinny.
To make you look thin, your image needs to be compressed horizontally or extended vertically.
So for those who wants to be thinner, bend you mirror.
If the center bulges out a little bit, you will appear shorter.
but your size will not be changed.
This can make a person look fatter than in real life.
If the center bends back a little, then you may look taller without looking any bigger.

Most mirrors bend over time.
So if you feel fatter/thinner/taller/shorter then you are supposed to be,
Buy a new mirror.

So the next time someone looks in the mirror and says:
"Does this dress make me look fat?"
or
"I think these jeans make my butt look big"

Just tell them to buy a new mirror.


*extra information*
Ever heard of a kaleidoscope?
It's a tube-shaped thing that allows you to see mesmerizing patterns.
It also uses Reflections from the mirror to create a repeated pattern.
If there were no mirrors in the kaleidoscope,
All you would see is sparkling things.







Credits:
Wikipedia
webb.nmu.edu
newton

Elearning part 2 reg.2

What would happen if the freezing point of water became 10 degrees C?

Just imagine.
If you were living in a country where there are four seasons.
Winter is here! its below 10 degrees and its time to go out and build a snowman!
But, you got thristy. so you brought a cup of water outside.
And before you could even drink it, it froze!

So if this really happened,
People in Korea, China, New york, Italy etc.
They wont be able to drink any water outside during winter.

What if, that cold country happens to have waterfalls.
Beautiful frozen or unfrozen right?

But what happens to the fishes? or any wildlife that lives in the waterfall?
Technically, If the fish was even used to the winter time,
they would probably find it normal if the water was at 10 degrees.
But what if it was at 10 degrees and all the water got frozen.
All the wildlife in that waterfall would die.
You can't expect them to swim away in ice right?

What if all the rain became ice once it reached the ground?

On the plus side, It does make that spot look like a winter wonderland.
I would like to see how you sit on it!

The same thing goes for this frozen boat.

100% beautiful.
but how are you going to set sail?
If this was a fisherman's boat, He would have to miss one day of catching fish.
But then again, all the water would be frozen.
So there would be no reason for him to fish for fish popsicles.

What if a tidal wave got frozen?

It does make a good tourist attraction.
But what if there was a sudden drastic change of temperature?
The ice would melt and flood the area with freezing cold water.
What if the innocent tourist just wanted to take a picture and did not know how to swim?
Forget it, I doubt the drastic change of temperture would be that drastic.

And how would the farmers water their crops during winter?


As you can see, the freezing point of water can really affect our lives.
Although Singapore would not get affected if this really happened,
I'm glad it did'nt.
Because I love the fact that the freezing point of water is zero (:

Have you all ever heard of the saying
"freeze your butt off?"

PHONES.

The invention I chose is something that nearly everyone in singapore has and needs.

Something that is almost necessary and definitely important for our daily lives.

Even my old Grandmother needs one.

A phone.

But not just a phone.

A handphone.

In 1908, the first wireless phone was handed to Nathan B. Stubblefield of Murray, Kentucky.

The reason for the invention of a handphone is unknown.

But it's not hard to guess.

who doesn't want to be in contact 24/7?

Cells for mobile phone base stations were invented in 1947 by Bell Labs engineers at AT&T and further developed by Bell Labs during the 1960s.

In 1960, the world’s first partly automatic car phone system Mobile System A (MTA)MTA was launched in Sweden.

With this, calls can be made and recieved in the car to/from the public telephone network, and the car could be paged.

MTA phones were consisted of vacuum tubes and relays, and had a weight of 40 kg.

In 1962, a more modern version called Mobile System B (MTB) was launched, which was a push-button telephone, and which used transistors in order to enhance the telephone’s calling capacity and improve its operational reliability.

In 1971 the MTD version was launched, opening for several different brands of equipment and gaining commercial success.

In 1973, Martin cooper was considered to be the inventor of the first practical mobile phone for hand-held use in a non-vehicle setting, after a long race against Bell Labs for the first portable mobile phone.

Using a modern, if somewhat heavy portable handset,

Cooper made the first call on a hand-held mobile phone on April 3, 1973 to his rival, Dr. Joel S. Engel of Bell Labs.

He is so cool! ;D

Just imagine how telephones improved from the past.

1964

1970s

1973

1983

1991

1997-2003

phones of today

now that you know,

appreciate the fact that you were born in this century.

Because personally, I love technology (:

-kimberly