Volume of cube = s3 = 103 = 1000cm3
Volume of cube submerged = 10 cm x 10 cm x 4.5 cm = 450 cm3
Volume of water displaced = volume of cube submerged = 450 cm3
Mass of water displaced = 1 cm3 x 450 cm3 = 450g (density of water is 1 cm3)
Mass of cube = Vcube x ρcube
But, mass of cube = mass of water displaced
1000 cm3 x ρcube = 450g
ρcube = 4501000 = 0.45 g/cm3
