What is the radius of one kg platinum ball?

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  • 1 month ago
    Favorite Answer

    Let R cm be the required Radius :

    Volume of the spherical ball = (4/3) π R³ cm³

    We know that Density of Platinum  =  21.45 g/cm³

    =>  mass of the ball  =  Density * volume  =  21.45 * (4/3) π R³   gram

    =>  But  mass of the ball is =  1 kg ( 1000 g ) ................ Given

    =>  21.45 * (4/3) π R³  =   1000

    ..       .      . 1000 * 3

    =>  R³  =  ------------------  =  11.12971633  

     ..   .  . .    21.45 * 4 * π 

    => R  =  2.233 cm  .................... Answer

  • alex
    Lv 7
    1 month ago

    density = 21.45 g/cm^3

    --->Volume = mass / density = 46.62 cm^3

    V= (4/3)πr^3

    solve for r

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