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What is centrifugal force? Physics definitions

By |2019-03-11T05:58:01-07:00August 16th, 2017|Islam, Physics|

Kids playing tetherball using centrifugal force Who first explained centrifugal force? When something is going straight, it always keeps going straight unless something else stops it or turns it. (The Iranian scientist Ibn Sina figured this out about 1000 AD). Who was Ibn Sina? Medieval Islamic science All our physics articles An example of centrifugal [...]

What is tin? Atoms, elements, chemistry

By |2018-04-16T14:02:21-07:00June 2nd, 2017|Chemistry|

Like the other metals, tin is one of the heavier kinds of atoms. Every atom of tin has 50 protons and 69 neutrons in its nucleus (depending on the isotope; the exact kind of tin). Like other metals, all tin atoms form inside older stars that have become supernovas. On Earth, tin is very common. [...]

What is nitrogen? Atoms, Elements, Chemistry

By |2018-04-24T14:46:22-07:00June 2nd, 2017|Chemistry|

Diagram of a nitrogen atom Inside a red giant star, the star smashes lighter atoms together. Smashing atoms gets the star energy to burn, and also leaves extra heavier atoms. Nitrogen is one of these heavier atoms, left over when a star smashes together carbon atoms. Nitrogen is not very heavy, though, and a [...]

What is iron? Atoms, elements, chemistry

By |2018-04-24T14:46:24-07:00June 2nd, 2017|Chemistry|

Diagram of an iron atom When a red giant star finishes changing all of its helium into carbon and oxygen, it then starts to turn the carbon and oxygen atoms into iron atoms. Iron is the heaviest kind of atom that a star can make, so when a star has made most of its carbon and oxygen [...]