Question

A raft of wood (density`=600kg//m^(3))` of mass `120 kg` floats in water. How much weight can be put on the raft to make it just sink?
A. 80 kg
B. 50 kg
C. 60 kg
D. 30 kg

Answer 1

Correct Answer - A
For just sink, `(m_("raft")+m)g==V_("raft")rho_(w)g`
`therefore" "m=V_("raft")rho_(w)-m_("raft")`
`=120/600xx1000-120=80 kg`