Properties of Matter 2 Question 6

6. A homogeneous solid cylinder of length L and cross-sectional area A/5 is immersed such that it floats with its axis vertical at the liquid-liquid interface with length L/4 in the denser liquid as shown in the figure. The lower density liquid is open to atmosphere having pressure p0.

Then, density D of solid is given by

(a) 54d

(b) 45d

(c) 4d

(d) d5

(1995,2M)

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Answer:

Correct Answer: 6. (c)

Solution:

Considering vertical equilibrium of cylinder

Weight of cylinder = Upthrust due to upper liquid + upthrust due to lower liquid

(A/5)(L)Dg=(A/5)(3L/4)(d)g +(A/5)(L/4)(2d)(g)

D=(34)d+(14)(2d)D=54d



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