Physics-
General
Easy

Question

A uniform rod of density rho, and length 'l' is having square cross-section of side 'a'. It is placed in a liquid of equal density rho vertically along length in a tank having sufficient height of liquid. The surface tension of liquid is 'T' and angle of contact is 120° Then :

  1. Rod will float completely immersed inside the liquid    
  2. Rod will sink to bottom of tank    
  3. Rod will float partially submerged with height fraction numerator 4 T over denominator a rho g end fraction above liquid.    
  4. Rod will float partially submerged with height fraction numerator 2 T over denominator a rho g end fraction above liquid.    

The correct answer is: Rod will float partially submerged with height fraction numerator 2 T over denominator a rho g end fraction above liquid.

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The gas molecules randomly move in all directions and collide with each other and with the wall of the container. It is difficult to determine the speed of an individual molecule but it has become possible to work out the distribution of molecules among different molecular speeds. This is known as Maxwell Boltzmann distribution. Consider the following graph about Maxwell's distribution of speeds at two different temperatures T subscript 1 end subscript and T subscript 2 end subscript :

The shaded area represents:

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The shaded area represents:

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