A beaker containing water is placed on a scale balance which indicates a mass of 0.5 kg.A glass sphere of mass 0.2 kg is suspended from a string and immersed in water such that it doesn't touches the beaker. if the relative density of glass sphere is 2.5 then the reading of the balance will changes to

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Answers

2014-05-14T19:36:06+05:30
Relative density d = Dg /Dw = 2.5     (Dg = density of glass sphere  ,Dw = density ofwater)
mass of beaker is 0.5 Kg
mass of glass sphere is m = 0.2 kg
force on glass sphere when immersed in water are ; force of gravity downward mg in magnitude and due to water upward force V*Dw*g
V = volume of glass sphere = m/Dg
net force on glass sphere is = (m - m*Dw/Dg)*g downward
                                         = (0.2 - 0.2/2.5)*g
                                         = 0.12g downward
total reading of the balance is = (0.5 +0.12)Kg = 0.62Kg
hence reading of the balance will change to 0.12Kg
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