could someone help me with physics ! Please !

Question

could someone help me with physics ! Please  !

anonymous · Answer

how??

anonymous · Answer

this is the question, 
A completely submerged chunk of metal sinks in water with an acceleration equal to one-fifth of g (where g = 9.8 m/s\ Find the specific gravity (defined above) of this metal. Note, ignore all drag effects in the fluid.

anonymous · Answer

1.2

anonymous · Answer

could you explain it with details?

anonymous · Answer

yeah.. of course

anonymous · Answer

say, the density of metal is d g/cc, density of water is 1 g/cc

anonymous · Answer

so, the weight of the metal= vdg
weight of displaced water=buyoancy= vg
so, the net downward force= vdg-vg
the mass of the chunk=vd
so the downward acceleration= (vdg-vd)/vd=g/5 (according the question)
solve it, u will get the answer :)

anonymous · Answer

thanks a lot !