text: Dear Student,
  
  Volume of the wooden cube
  = 10 x 10 x 10 = 1000 cm3
  
  When the cubic block floats, the volume of water displaced by the submerged part
  
  = 10 x 10 x (10-3)
  = 700 cm3
  
  Mass of this water
  
  = V x d
  = 700 x 1 => 700 g
  
  As the cubic block is floating,
  
  Weight of the displaced water = Weight of the block
  
  Hence, density of the block = Mass /Volume
  
  = 700/ 1000
  
  = 0.7 g/cm-3
  
  So, density of water = 1 g/cm3
  So, Part of cube submerged in water,
  = density of body/density of water
  = 0.7/1
  = 7/10
  
  Part of the cube above water = 1 - 7/10
  = 3/10
  Hence, 3 cm of cube is above the water.
  
  Regards
  
  • 1
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