N solid metallic spherical balls are melted and recast into a cylindrical rod whose radius is 3 times that of a spherical ball & height is 4 times the radius of a spherical ball. The value of N is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 27.
As, N solid balls are melted and recast into a cylindrical rod,
then volume of N balls = volume of cylindrical rods
as R = 3r
h = 4r
N = 27