Q3 of 75 Page 236

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 per cm3?

Radius (r) = 2.1 cm

Volume = πr3


= * * (2.1)3


= 38.808 cm3


Density =


Mass = Density * Volume


= 8.9 * 38.808


= 345.3912 g


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