Question

The mass of a circular disc varies as the squares of
the radius when the thickness remains the same; it
also varies as the thickness when the radius remains
the same. Two discs have their thicknesses in the
ratio of 16:3; find the ratio of the radii if the mass
of the first is thrice that of the second.
(a) 3:4
(b) 5:2
(d) 1:2
(c) 2:1​

Answer 1

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