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An object weighs 80g in air …

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An object weighs 80g in air and 64g in water. What is the relative density of the object?

  • 1 answers

Naveen Sharma 8 years, 11 months ago

Archimedes: When a body is immersed in a fluid it undergoes a loss in mass equivalent to the mass of fluid displaced . 

Loss in mass = 80g - 64g = 16g H2O displaced 
Density of water = 1g/mL 


Therefore the object displaced 16mL of water = volume of the object . 
Relative density when kept in water = mass / volume 


Relative density = 64g/ 16mL 
Relative density = 4g/mL 


Object will sink in water.

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