Ahollow sphere of inner radius 8.82 cm and outer radius 9.91 cm floats half-submerged in a liquid of density 948.00 kg/m^3. (a) what is the mass of the sphere? (b) calculate the density of the material of which the sphere is made.

a) 0.568 kg

b) 474 kg/m³

Explanation:

Given:

Inner radius = 8.82 cm = 0.0882 m

Outer radius = 9.91 cm = 0.0991 m

Density of the liquid = 948.00 Kg/m³

a) The volume of the sphere =

or

volume of sphere = 0.0012 m³

also, volume of half sphere =

or

volume of half sphere =

or

Volume of half sphere =0.0006 m³

Now, from the Archimedes principle

Mass of the sphere = Weight of the volume of object submerged

or

Mass of the sphere = 0.0006× 948.00 = 0.568 kg

b) Now, density =  

or

Density =

or

Density = 474 kg/m³

f=ma newton's second law 7x8=56n