Question

9. Two cubes have their volume in the ratio 1:64 what is the ratio of their surface areas?
10. A solid sphere of radius 10cm is moulded into 8 spherical solid balls of equal radius​

Answer 1

Answer:

9)Ratio of Vols. ofcubes = 1:64

Ratio of edges=1:4

Ratio of SA's=6:96 (6a2)

= 1:16. Ans

10) Vol of sphere = 4/3πr^3

4/3xπx/10^3

volume of 8 small cubes = 4/3πx10^3=4/3πx8xX^3 (x = Radius)

X^3=4πx10^3x3/4 x 3xπx8=looo/8

= 125

x^3=125

x = 5cm

Radius=5cm