A hollow sphere of radius R is made of a metal whose specific gravity is ρ . The sphere will float in water if the thickness of wall of the sphere is(density of water is 1 gm/cc)
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a
>R3ρ
b
=2R3ρ
c
d
<4R3ρ
answer is C.
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Detailed Solution
4πR2xρ=43πR3ρw x →the thickness of the wall.xρ=R3 ρw=1x=R3ρ