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December 22, 2014

December 22, 2014

Posted by **yasin** on Sunday, December 8, 2013 at 2:51pm.

- physics -
**Elena**, Sunday, December 8, 2013 at 4:21pmAt rest: circle

A=πR²

Motion with v=0.8c

r=Rsqrt(1-β²)

=R(1-0.8²) =0.6R

Area of the ellipse

A₁=πRr=π0.6R² =0.6A

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