A plastic foam (foam = 580 kg/m3) is used to make a life preserver. What volume of foam must be used if it is to keep 29% (by volume) of a 87.8 kg man above the water in a lake? The average density of the man is equal to = 1040 kg/m3.
Can someone show me how to apply the principle? Really stuck on this problem ie. where to begin?