Posted by julie on .
A frog in a hemispherical pod finds that he just floats without sinking in a fluid of density 1.30 g/cm3. If the pod has a radius of 3.00 cm and negligible mass, what is the mass of the frog?

physics 
bobpursley,
density= mass/volume
mass= density*volume
the volume of a sphere is 4/3 PI r^2, so the volume of a hemisphere is half that.