What objects float and what objects me plz

The "density" of any thing or substance is

    (the mass of a piece or sample of the thing or substance)
divided by
     (the volume of the same piece or sample) .

When the density of an object is less than the density
of the fluid you drop it into, the object floats.

When the density of an object is more than the density
of the fluid you drop it into, the object sinks.

Some things that float are boats apples plastic anything light some things that sink are rocks metal 

Pe = 1/2k(x)^2  and .05n/m = .05x10^-9m = x