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Question

A cylindrical vessel of a very large cross-sectional area is containing two immiscible liquids of density ρ1 = 600kg/m3 and ρ2 = 1200 kg/m3 as shown in the figure.A small hole having cross-section area 5 cm2 is made In right side vertical wall as shown. Take atmospheric pressure as ρ0 = 105 N/M2 g = 10 m/s2. From this situation, mark out the correct statement(s). (Take cross-section area of the cylindrical vessel as 1000 cm2. Neglect the mass of the vessel.)
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A
If the surface on which the vessel is placed is smooth, then a rightward force of magnitude 3 N is to be applied on the vessel to maintain its static equilibrium
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B
If the surface on which the vessel smooth, then a rightward force of maintain its static equilibrium
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C
If the surface on which the vessel is placed is rough (μ = 0.04), then the minimum force (horizontal) needed to be applied on the vessel to maintain its static equilibrium is zero
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D
If the surface on which the vessel is placed is rough (=0.04), then the maximum force (horizontal) needed to be applied on the vessel to maintain its static equilibrium is 19.8 N
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Solution

The correct options are
A If the surface on which the vessel is placed is smooth, then a rightward force of magnitude 3 N is to be applied on the vessel to maintain its static equilibrium
C If the surface on which the vessel is placed is rough (μ = 0.04), then the minimum force (horizontal) needed to be applied on the vessel to maintain its static equilibrium is zero
D If the surface on which the vessel is placed is rough (=0.04), then the maximum force (horizontal) needed to be applied on the vessel to maintain its static equilibrium is 19.8 N
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