An object of mass 400g and density 600kgm-3 is ... - JAMB Physics 1993 Question
An object of mass 400g and density 600kgm-3 is suspended with a sting so that half of it is immersed in paraffin of density 900kgm-3. The tension in the string is
A
1.0N
B
3.0N
C
4.0N
D
5.0N
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Correct Option: B
volume of object = (\frac{400 \times 10^{-2}}{600})
= 0.00067m3
volume of paraffin displaced = (\frac{1}{2}) x 0.00067
= 0.00034m3
mass of paraffin = 900 x 34 x 10-5
= 0.3kg
weight of paraffin = 0.3 x 10
= 3N = upthrust = tension in the string
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