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1.
A log of wood of mass 
floats in water. The weight that can be put on raft to make it just sink, should be (density of wood 
)
floats in water. The weight that can be put on raft to make it just sink, should be (density of wood )
2.
The excess pressure inside one soap bubble is three times that inside a second soap bubble, then the ratio of their surface areas is
3.
A streamline body with relative density 
falls into air from a height 
on the surface of a liquid of relative density
, where
. The time of immersion of the body into the liquid will be
falls into air from a height on the surface of a liquid of relative density, where. The time of immersion of the body into the liquid will be
4.
A body floats in water with one-third of its volume above the surface of water. If it is placed in oil, it floats with half of its volume above the surface of the oil. The specific gravity of the oil is
5.
A capillary tube of radius 
and length 
is connected in series with another tube of radius 
and length
. If the pressure difference across the two tubes taken together is 
, then the ratio of pressure difference across the first tube to that across the second tube is
and length is connected in series with another tube of radius and length. If the pressure difference across the two tubes taken together is , then the ratio of pressure difference across the first tube to that across the second tube is