Question

the diameter ofa mettallic ball is 4.2cm.what is the mass of the ball if the density of the metal is 8.9 g per cm3

Answer 1

Hi friend
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Your answer
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Diameter of a metallic ball = 4.2 cm

Radius = 4.2/2 cm = 2.1 cm

Volume of the ball =
$\frac{4}{3} \pi \: r {}^{3}$
So,
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$volume \: = \frac{4}{3} \times \frac{22}{7} \times \frac{21}{10} \times \frac{21}{10} \times \frac{21}{10} \\ = \: \frac{38808}{1000} \: cm {}^{3} \\ \\ = \: 38.808 \: cm {}^{3}$
So,

Volume of the ball = 38.808 cm³

Mass of the ball = (38.808 × 8.9) grams = 345.3912 grams

HOPE IT HELPS

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