Question

A certain spherical ball of diameter 4 cm weighs
8 kg. Find the weight of a spherical ball of the same material whose inner and outer diameters are 8 cm and 10 cm​

Answer 1

Answer:

for 8 cm diameter,it weighs 16 kg and for 10 cm diameter it weighs 18 kg

Answer 2

Answer:

Given, internal diameter =8cm and external diameter =10cm

Volume of a hollow sphere of outer Radius R and inner radius r =

3

4

π(R

2

−r

3

)

Inner radius of the spherical shell =

2

8

=4cm

Outer radius of the spherical shell =

2

10

=5cm

Hence, volume of spherical shell =

3

4

×π×(5

3

−4

3

)=

3

4

×π×61=

3

244π

cm

3