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Q.

A cylindrical container of cross-sectional area 2 m2 is partially filled by water. A wooden block of mass 2 kg is gently placed on the free surface of water. Then increase in pressure on the bottom of the container is [density of wood is 0.85 gm/cm3]

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a

20 N/m2

b

10 N/m2

c

5 N/m2

d

cannot be calculated due to insufficient information

answer is B.

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Detailed Solution

Buoyant force exerted by water on the block of wood = weight of the block = 20 N

Then force exerted by the block on water = 20 N

Increase in pressure at the bottom =202N/m2=10 N/m2

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