Properties Of Solids And Liquids Question 195

Question: A liquid is kept in a cylindrical vessel which is being rotated about a vertical axis through the centre of the circular base. If the radius of the vessel is r and angular velocity of rotation is ω , then the difference in the heights of the liquid at the centre of the vessel and the edge is

Options:

A) rω2g

B) r2ω22g

C) 2grω

D)ω22gr2

Show Answer

Answer:

Correct Answer: B

Solution:

From Bernoulli’s theorem,

PA+12dvA2+dghA=PB+12dvB2+dghB

Here,hA=hB

 PA+12dvA2=PB+12dvB2

therefore PAPB=12d[vB2vA2]

Now,vA=0, vB=rω

and PAPB=hdg

  hdg=12dr2ω2 or h=r2ω22g



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