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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A non-viscous liquid of constant density 500 kg/m^3 flows in a variable cross-sectional tube. The area of cross section of the tube at two points P and Q at heights of 3 m and 6 m are 2 × 10^−3 m^3 and 4 × 10^−3 m^3, respectively. Find the work done per unit volume by the forces of gravity as the fluid flows from point P to Q.

A non-viscous liquid of constant density 500 kg/m^3 flows in a variable cross-sectional tube. The area of cross section of the tube at two points P and Q at heights of 3 m and 6 m are 2 × 10^−3 m^3 and 4 × 10^−3 m^3, respectively. Find the work done per unit volume by the forces of gravity as the fluid flows from point P to Q.

A block of ice of area A and thickness 0.5 m is floating in the fresh water. In order to just support a man of 100 kg the area A should be (specific gravity of ice 0.917 and density of water = 1000 kg/m^2)