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Showing posts with the label physics

Will 1 kg gold weight the same after many years?

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Here is an interesting thing about any matter on the world . For example gold. If you own 1kg gold now. Than after a thousand years you will own a little more than 1kg. Surprised? Don't be. Here is an interesting and tottaly useless facts you never will need to know. But still, it just came into my mind recently. Sun  - the star of our galaxy is producing enormous amount of energy, right? Each second 600 000 000 tons of hydrogen atoms are smashed together with such a speed, that those atoms make 595 000 000 tons of helium atoms. Now the missing 5 000 000 tons are transformed into light energy. Yes. It's funny. 5 000 000 tons of light. No kidding.  And eventually small portion of all this light hits earth surface causing the earth to grow.  Obviously after many, many years earth mass will be bigger, and thus the gravity  it causes also will be bigger. So the very same 1 kg you own now will be heavier on planet earth. If i had some free time i would really like to do some math h...

What is the color of mirror?

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The reason why mirror reflects all of the light beams in the same angle as light beams hit mirror surface is because mirrors are perfectly flat. And because all light reflects from mirror maintaining it's original angle, image is perfectly reflected and reconstructed.  All objects absorbs all light waves that hits it, except the lightwaves with color into which an object is itself. For example EU flag will absorb green, red, pink, orange, etc., but will reflect blue light waves. One exception needs to be mentioned here. There is no corresponging lightwave for black color and white color. Human eye indicates that object is white, if object reflects (or emits) all possible visible light waves. And in contrast black is indicated if there is no lightwaves. Mirrors are manufactured out of aluminium. Aluminiums is used because of it's suitable physical properties, and because it is almost white. Yes, aluminium is not perfect. It would be more better if aluminum was white. If you look...