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denis-greek [22]
3 years ago
7

What are three inventions used to reduce friction??

Biology
1 answer:
serious [3.7K]3 years ago
5 0
Lubricants, Magnetic Levitation, Ball Bearing
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One of the methods used widely to calculate the distance of nearby or closer objects in astronomy is Parallax. The distance of the stars are usually expressed in light years but the unit of distance is parsec or parallax second.  

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