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Mechanical Properties of Fluids
Question
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Why does the ship rise as it enters the sea from river?

Answer

The density of sea water is greater than the river water. Therefore, to balance the weight of ship, the volume of sea water displaced by the ship will be less than that of the river water. Hence on entering the sea from river the ship rises a little. 

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Some More Questions From Mechanical Properties of Fluids Chapter

What is fluid?

What is hydrostatics?

What is hydrodynamics?

Can fluids withstand tangential stress?

Can fluids withstand normal stress?

Why the fluids do not have any modulus of rigidity?

Which phase of fluid is more compressible?

What is an ideal liquid?

Do liquids exert pressure?

Define pressure.