the mysteries of science

Friday, April 2, 2010

i left what i needed to say here @9:49 PM

Why do oranges float? But when it is peeled, why does it sink?

Oranges will float because with their peel on, their density is less than one. The density of water is one, and anything with a density lesser than one, will float.

However, if the peel is removed, then the density of the orange would become more than one, thus, it will sink.

http://wiki.answers.com/Q/Why_do_oranges_float

How can a ship float even though it is so heavy?

The standard definition of floating was first recorded by Archimedea and goes on something like this:

An object in a fluid experience an upward equal to the weight of the fluid displace by the object. So if a boat weigh 1000 kilograms, it will sink into the water until it has displaced 1000 kilograms of water.

Provided that the boat displaces 1000 kilograms of water before the whole thing is submerged, the boat floats.

http://science.howstuffworks.com/question254.htm

How does submarine work?

Submarines are ships can operate both under and on top of water. One of the first submersible vessels was built around 1620 by a Dutchman named Cornelius van Drebbel.

Submarines are designed for use at great depths. Their rigid, double-walled hulls allow the crew live and work normally underwater for as long as air and power supplies last. Submarines are steered by turning a rudder left and right. A propeller moves the sub through the water, pushing water backward so that the submarine moves forward.

Submarines are a a mixture of metal (the hull), air, and water (the "ballast"). The secret of a submarine's ability to either sink or float lies in a special property of air. Unlike water or metal , air can be squashed into a tiny space. While the submarine is sinking, its air is compressed. Water fills the compartments called the ballast tanks. The combination of water and metal, with just a little bit of air in the centre for the crew to breathe, is more dense than the surrounding ocean water, and so the submarine sinks.

Once the submarine is underwater, air is pumped into the ballast tanks. The new combination of metal, water, and air is just dense as the surrounding water, so the submarine hovers, neither sinking nor rising. This is called "neutral buoyancy", and allows the sub to maneuver underwater.

When it's time to rise, even more air is pushed into the ballast tanks. This pushes water out, resulting in a mixture of air, metal, and water that is now less dense than the water surrounding the sub. Under these conditions, the sub rises to the surface.

http://www.islandnet.com/~yesmag/how_work/submarine.html

Why do we float when we hold our breath(with the air still in our mouth) in a swimming pool, but when we release the air, we sink?

The human body seems big and heavy, but it less dense than the water it displaces partly because our bodies contain fat, and because our lungs, are full of air.

When we hold our breath with the air still in our mouth, we become lighter than water. So, with the fat in our bodies, the air in our lungs and the air in our mouth, we are able to float.

However, when we release the air in our mouth, we also release the air in our lungs. So, with only the fat in our bodies to keep us buoyant, we start to sink.

http://wondertime.go.com/life-at-home/article/dreading-water_6.html

How do we measure the volume of irregular shaped corks?

1) Pour a measured amount of water into a measuring cylinder.

2)Attach a weight heavy enough to make the cork sink in water.

3)Allow the cork to sink in the cylinder and note the rise in the water level.

4)Remove the cork and the weight from the water. (Pour the everything out from the cylinder)

5)Pour in the same amount of water in step 1. (Make sure the now empty measuring cylinder is dry)

6)Put the weight into the water and note the new water level.

7)Take the water level taken from the weight and subtract it from the water level taken from the weight and the cork. The result will be the volume of the cork.

http://answers.yahoo.com/question/index?qid=20081015183719AAMnQsp

&the beauty of time is that once it starts ticking, it'll never stop.

Who am I?
I am Kimberley Lim.
kaye-eye-am-bee-ee-arr-ell-ee-wyy *space* ell-eye-am.

You may think I'm crazy,
but there's nothing wrong with me,
or my name.
FUN FACT about my name(Kimberley):
my name is the name of a state in Australia! (:

Everything is about simplicity.
It's just that simple.
It's just a matter of how you look at things.
That's when things can become from simple to complicated.

What I love is fairly simple.
Doing well in exams is what i love the most.
In this world,
doing well in academics might guarantee a good job.
that's why i strive to do well.
i may not be the best,
but at least I'm making full use of my abilities.
Other than that,
there's nothing I love more than
GOD, family and friends.
They're what makes my life oh-so-colourful.
travelling, photography, playing harp,
reading DARK romance novels, playing video games/computer games are
my passions.
it's what i'll do for now to relieve myself from the world of academics when i need it.
What I hate, is even simpler. What's the opposite of doing well for exams? Doing badly for exams! it's as simple as that.

what i want is what i love.
simple eh?

but there's nothing more that i want
than being able to
travel around the world
and bring back the memories
and wonders of the world
when i grow up.
that's all i ever want for my future.

Kimberly Kiong
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Kang Li Xin
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Soh Jing Wen
Rachel Wong
Kate Koh

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- please keep the credits AS THEY ARE :] thankyou.