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  4. A vessel with water is placed on a weighing pan and it reads 600 g. Now u ball of mass 40 g and density 0.80 g cm-3 is sunk into the water with a pin of negligible volume, as shown in figure keeping it sunk. The weighting pan will show a reading

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Q. A vessel with water is placed on a weighing pan and it reads $600 \,g$. Now u ball of mass $40 \,g$ and density $0.80 \,g \,cm^{-3}$ is sunk into the water with a pin of negligible volume, as shown in figure keeping it sunk. The weighting pan will show a readingPhysics Question Image

Mechanical Properties of Fluids

Solution:

Volume of ball $=\frac{40}{0.8}=50\, cm ^3$
Downthrust on water $=50 \,g$.
Therefore reading is $650\, g$.