Question

a cube of side 20cm is floating on a liquid with 5cm of the cube outside the liquid. if the density of the liquid is 0.8g/cc then the mass of the cube is

Answer 1

Total volume of cube = 20³ = 8000 cm³
volume outside the liquid= 5³ = 125 cm³
volume inside the liquid= 8000- 125 =  7875 cm³

weight of the cube is equal to the weight displaced by water

so,
mg = Vρg
m= 0.8 x 7875 
m= 6300
m = 6.3 kg

Answer 2

Answer: 4.8 kg

Volume 20*20*15=6000 cm^3