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Question:

Find the amount of water displaced by a solid spherical ball of diameter (i) 28 cm (ii) 0.21 m

Solution:

(i) r = 28/2 = 14 cm ⇒ Volume = 4/3 × 22/7 × r³ ⇒ Volume = 4/3 × 22/7 × 14 × 14 × 14 ⇒ 11498.66 cm³
(ii) r = 0.21/2 = 0.105, Vol = 4/3 × 22/7 × (0.105)³ ⇒ 0.004851 m³