A solid sphere of radius 4cm has a mass of 64kg. What will be the mass of a shell of the same metal whose internal and external radii are 2cm and 3cm respectively?

Babskenny

11 years ago

it is not correct check dis, the right ans is19kg

look at my explanation

The mass of a body is directly proportional to the volume

ratio of the volume of the shell to the sphere

=3^3-2^3/4^3 =19/64

let the mass of the shell, then

m/64=19/64

m=64*19/64=19kg

i.e the mass of the shell is 19kg

Oketolu

1 year ago

You used r² instead of r³.