GATE ME 2018 Set 2 — Question 50
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Fluid Mechanics → Fluid Kinematics & Dynamics → Applications of Bernoulli
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Question
A frictionless circular piston of area and mass sinks into a cylindrical container of the same area filled with water of density as shown in the figure. The container has a hole of area at the bottom that is open to the atmosphere. Assuming there is no leakage from the edges of the piston and considering water to be incompressible, the magnitude of the piston velocity (in m/s) at the instant shown is _____ (correct to three decimal places).

Correct answer
1.4 to 1.5
Solution
Applying Bernoulli's equation between the top surface of the piston (1) and the exit hole (2):At (1), the pressure is . At (2), the pressure is .From continuity equation: .
Substituting :.
Substituting :.
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