Question

equal to the weight of the immersed part of the body 2 . A raft of wood of mass 120 kg floats in water . The weight C that can be on the raft on make it just sink , should be $(d_{raft}=600kg/m_3)$

• A. 80 kg
• B. 50 kg
• C. 60 kg
• D. 30 kg

Answer 1

The correct option is C 60 kg

$d_r=600kg/m^3$

$m=120kg$

$v=0.2m^3$

now from weight and buoyant system

$\begin{array}{cc}(120+m^{\prime })g& =\rho \times 0.2\times g\\ \rho =1000& kg/m^3\\ m^{\prime }& =80kg\end{array}$

Correct option is (A).