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Hollow spherical shell of given density and radii: find its mass

The same question, asked 2 times: CDS 1 2021*, CDS 2 2021. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    CDS 1 2021

    70
    A hollow spherical shell is made up of a metal of density 3 g/cm3^3. If the internal and external radii are 5 cm and 6 cm respectively, then what is the mass of the shell? (Take π=227\pi = \frac{22}{7})

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  2. Question 2

    CDS 2 2021

    68
    A hollow spherical shell is made of a metal of density 7 g/cm3^3. If its internal and external radii are 3 cm and 6 cm respectively, then what is the mass of the shell ? (take π=227\pi = \frac{22}{7})

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