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an iron ball weights 11kg .in air and 8kg.when immersed in water.find its relative density?

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Here is a link which will help you to solve this question with proper explanation .
https://www.meritnation.com/ask-answer/question/weighs-80g-in-air-68g-in-water-and-60g-in-oil/gravitation/7178081

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Relative density is equal to (mass of substance)/(mass of substance in water) Hence, 11/8
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1.375 is the answer as relative density is equal to the ratio of density of substance over density of given reference
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it will be sink
 
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We know that density of iron is approx 8,000kg/m^3 and density of water is 1,000kg/m^3
So relative density =density of substance/density of water
Therefore 8000/1000=8
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