The diameter of a metallic ball is 4.2 c...

The diameter of a metallic ball is 4.2 cm. What is the mass of the ball, if the density of the metal is `8. 9\ g\ p e r\ c m^3`?

Text Solution

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volume of a metallic ball
`V=4/3pir^3`
`V=4/3xxpixx(2.1)^3`
We know,
`bb"Density"=bb"mass"/bb"volume"`
`bb"mass"=bb"density"xxbb"volume"`
`m=8.99xx4/3xxpixx(2.1)^3`
`m=345.08g`

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