Question

A block of wood floats in water with 4/5th of its volume submerged, but it just floats in other liquid. density of liquid is:?
and: 800

Answer 1

Due to Archimedes' principle:

If block of wood floats in water with 4/5 of its volume, the density of wood is 4/5 of water's density:

$$\rho (\text{wood}) = \frac{4}{5} \rho (\text{water}) = 800 \, \text{Kg/m}^3$$

If block of wood just floats in other liquid, density of wood is equal to density of liquid:

$$\rho (\text{wood}) = \rho (\text{liquid}) = 800 \, \text{Kg/m}^3$$

Answer:

The density of liquid is: $800 \, \text{Kg/m}^3$

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