Sum

The mass of a block made of certain material is 1.35 kg and its volume is 1.5 x 10^{-3} m^{3}.

- Find the density of block.
- Will this block float or sink? Give reasons for your answer.

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#### Solution

Mass of block = m = 1.35 kg

Volume of block = V = 1.5 x 10^{-3} m^{3 }

(1) Density of block = `"m"/"V" = 1.35/(1.5 xx 10^-3) = 900` kgm^{-3}

(2) Density of block (900 kgm^{-3}) is less than density of water (1000 kgm^{-3})

∴ Block will float in water

Concept: Archimedes' Principle

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