8. The mass of a spherical ball of radius 2 cm is
8 kg. Find the mass of a spherical shell of the same
material whose inner and outer radii are 4 cm and
5 cm respectively.
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Step-by-step explanation:
A certain spherical ball of radius 2cm
has a mass of 8kg
mass of spherical ball 4/3 fai R³
R=radius=diameter
mass of spherical shell whose outer and inner radii are 4 cm and 5 cm
=4/3fai5qub -4/3fai4qub
=4/3fai ( 125-64)
=4/3fai *61cm qub
= mass *density*volume
=3/4fai *4*3 fai *61
=61 kg...
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