Question

A block of wood floats in water with $\frac{4}{5}$th of its volume submerged, but it just floats in another liquid. The density of liquid is? (in kg$/m^3$)

• A. $750$
• B. $800$
• C. $1000$
• D. $1250$

Answer 1

Answer: (B)

$800$

${\rho }_1=\rho \times \frac{v4}{5v}=54e$

${\rho }_2=\rho \times v=\rho$

${\rho }_1=54{\rho }_2$

${\rho }_2=45\times 1000=800kg{m}^{-3}$