A rubber ball floats in water with $2 / 7$ of its volume above the surface of water $.$ Calculate the average relative density of rubber ball $.$

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Solution

volume of the rubber ball above the surface of water $= \frac{2}{7}$
therefore $,$ volume of the rubber ball below the surface of water $1 - \frac{2}{7} = \frac{5}{7}$
So $,$ average relative density of the rubber ball $=$ $\frac{V o l u m e o f t h e b e l o w t h e s u r f a c e o f w a t e r}{v o l u m e o f t h e b a l l} = \frac{5}{7 \times 1} = 0.71$
We get, Average density of rubber ball is $0.71.$

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