Case Study-I

A golf ball is spherical with about 300 500 dimples ts that help increase velocity while in play. Golf balls are in traditionally white but availaDlie colours also. In the given figure, a golf ball has diameter 4.2 cm and the surface has 315 dimples (hemi-spherical) of radius 2 mm.



Based on the above, answer the following questions

(i) Find the surface area of one such dimple.
(ii) Find the volume of the material dug out to make one dimple
(iii) (a) Find the total surface area exposed to the surroundings

OR

(iii) (b) Find the volume of the golf ball.

Solution

,,