Question

while floating in water 5/6 part volume of a wooden piece is immersed in water .what is the relative density of wooden piece ?. plz explain

Answer 1

From the Law of floatation , 
weight of wooden piece = weight of water displaces by waster immersed ...

RD wood     X    V     = RD water  X  5/6 V 
 = 1 X 5/6 
= 5/6 

Answer 2

I think Relative density should be the density of substance upon the density of water density of substance =5/6 and divide by one the density of water =0.83