Mar 13, 2008

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Big Bang Era

big_bang_era

Click for a better view. A nice illustration of different types of matter appearing in the universe.

Source

Talk Like a Physicist

Mar 13, 2008

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Physics is all about scales : Earth Water and Air

Ask a person “how much water there is on earth?” and chances are you will hear 67% or 70% as the answer.

And ask them “how much air is on the earth?” and chances are you will get a blank stares.

This picture illustrates the scales remarkably well.

earh_air_water

The water sphere measures 1390 kilometers across and has a volume of 1.4 billion cubic kilometers. This includes all the water in the oceans, seas, ice caps, lakes and rivers as well as ground water and that in the atmosphere.

The air sphere measures 1999 kilometers across and weighs 5140 trillion tones. As the atmosphere extends from Earth it becomes less dense. Half of the air lies within the first 5 kilometers of the atmosphere.

So the answer to the questions are:

1.1% water

2.7% air

Source:
ADAM NIEMAN / SCIENCE PHOTO LIBRARY

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Mar 13, 2008

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Physicists do it

Physicists do it a quantum at a time.
Physicists do it attractively.
Physicists do it energetically.
Physicists do it in black holes.
Physicists do it in waves.
Physicists do it magnetically.
Physicists do it on accelerated frames.
Physicists do it particularly.
Physicists do it repulsively.
Physicists do it strangely.
Physicists do it up and down, with charming color, but strange!
Physicists do it with black bodies
Physicists do it with charm.
Physicists do it with large expensive machinery.
Physicists do it with rigid bodies.
Physicists do it with string and sealing-wax.
Physicists do it with Tensors.
Physicists do it with their vectors.
Physicists do it with uniform harmonic motion.

Physicists get a big bang.

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Mar 13, 2008

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Physics one-liners

The Universe is a big place… perhaps the biggest

Black Holes were created when God divided by zero!

Do radioactive cats have 18 half-lives?

Resistance Is Useless! (If < 1 ohm)

A rolling stone gathers momentum.

PS: This message was written entirely with recycled electrons.

Talk Like a Physicist

Mar 13, 2008

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How many Heisnebergs does it take to change a light bulb

heisenberg

Q: How many Heisenbergs does it take to change a light bulb?
A: If you know the number, you don’t know where the light bulb is.

Q: How many astronomers does it take to change a light bulb?
A: None, astronomers prefer the dark.

Talk Like a Physicist