Find the amount of water displaced by a solid spherical ball (completely immersed in water) of diameter

(i) 28 cm 

(ii) 0.21 m

We know that volume of the sphere = (4/3) πr³

We know, the amount of water displaced by a solid spherical ball when it is completely immersed in water is equal to its volume.

(i) Diameter = 28 cm

Radius, r = 28/2 cm = 14 cm

Using the above formula,

Volume of the ball = (4/3) × (22/7) × 14³ 

= 34496/3

Hence, the volume of the ball is 34496/3 cm³.

(ii) Diameter = 0.21 m

Radius of the ball = 0.21/2 m = 0.105 m

Using the above formula,

Volume of the ball = (4/3)× (22/7)×(0.105)³ m³

= 0.004851 m³

Hence, the volume of the ball = 0.004851 m³