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A cube of water with side 10.0 cm floats vertically in water with 4.5 cm...

Physics
WAEC 2024

A cube of water with side 10.0 cm floats vertically in water with 4.5 cm its length submerged. Calculate the density of the wood.
[Density of water = 1 g/cm\(^3\); D = 0.090 g/cm\(^3\)]

  • A. 0.090 g/cm\(^3\)
  • B. 0.450 g/cm\(^3\)
  • C. 0.230 g/cm\(^3\)
  • D. 0.0450 g/cm\(^3\)
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Correct Answer: Option B
Explanation

Volume of cube = s\(^3\) = 10\(^3\) = 1000cm\(^3\)

Volume of cube submerged = 10 cm x 10 cm x 4.5 cm = 450 cm\(^3\)

Volume of water displaced = volume of cube submerged = 450 cm\(^3\)

Mass of water displaced = 1 cm\(^3\) x 450 cm\(^3\) = 450g (density of water is 1 cm\(^3\))

Mass of cube = V\(_{cube}\) x \(\rho_{cube}\)

But, mass of cube = mass of water displaced

1000 cm\(^3\) x \(\rho_{cube}\) = 450g

\(\rho_{cube}\) = \(\frac{450}{1000}\) = 0.45 g/cm\(^3\)

 

 


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