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  4. The vessels A and B of equal volume and Weight are immersed in water to depth h. The vessel A has an opening at the bottom through which water can enter. If the work done in immersing A and B are WA and WB respectively, then

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Q. The vessels $A$ and $B$ of equal volume and Weight are immersed in water to depth $h$. The vessel $A$ has an opening at the bottom through which water can enter. If the work done in immersing $A$ and $B$ are $ {{W}_{A}} $ and $ {{W}_{B}} $ respectively, then

ManipalManipal 2008

Solution:

Because water enters into the vessel A it becomes hevier. Gravity helps it to sink. External work required for immersing A is obviously less than that for immersing B.