question_answer

  (a) A cube of side 5 cm is immersed in water and then in saturated salt solution. In which case will it experience a greater buoyant force. If each side of the cube is reduced to 4 cm and then immersed in water, what will be the effect on the buoyant force experienced by the cube as compared to the first case for water. Give reason for each case. (b) A ball weighing 4 kg and of density 4000 kg/m3 is completely immersed in water of density 103 kg/m3. Find the force of buoyancy on it. [Given, g =10 ms-2 ] 

Answer:

   (a) Buoyant force,  Buoyant force depends upon volume of solid and density of water, since saturated salt solution have higher density than the water. So, in saturated solution, cube will experience a greater buoyant force. If each side of the cube is reduced to 4 cm, the volume of cube will become less. So, buoyant force will be less than as compared to the first case for water.                           (b) The magnitude of the buoyant force depends on the density of the fluid Volume or solid Buoyancy,