One end of Iron chain is fixed to sphere of mass M and of diameter D. The volume of sphere is V. The other end is free. The length of chain is λ and mass is m. The sphere with the chain is in the reservoir whose depth is H. Density of water is ρ W and density of iron is ρ F .
(i) Total force of gravity acting on the system is–
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Ans.
(i)
Sol. 
g
(ii)
Sol. ρ W 
g
(iii)
Sol. 
+ 
λ
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