Question

twenty seven solid iron spheres, each of radius r and surface area S is melted to form a sphere with surface area S' . Find the
(1) radius r' of the new sphere, (2) ratio of S and S' .​

Answer 1

Step-by-step explanation:

Total solid sphere = 2

Let old sphere radius be = r

new sphere radius = R

we have to find the radius of new sphere

volume of old sphere = volume of new sphere

27X 4/3 X22/7xr3 = 4/3X 22/7 R3

• R3=
• $\sqrt{?} r \times 3$R= r*3

ratio of surface = s/S

1/9