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**Unformatted text preview: **12.55: In terms of the density , the ratio M R is ( 4 3) R 2 , and so the escape speed is
v= ( 8 3) ( 6.673 10-11 N m 2 kg 2 2500 kg m3 150 103 m )( )( ) 2 = 177 m s. ...

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