## Trending News

Promoted

# What is the radius of one kg platinum ball?

### 2 Answers

Relevance

- Pramod KumarLv 71 month agoFavorite 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

- alexLv 71 month ago
density = 21.45 g/cm^3

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

V= (4/3)πr^3

solve for r

Still have questions? Get your answers by asking now.