Question

Volume of an object is 20 cm3 and the mass in 50 g. Density of water is 1 gcm-3. Will the object float on water or sink in water?

Answer 1

volume of an object is V = 20cm³
mass of object is m = 50g
so, density = mass/volume
density of given object = 50g/20cm³ = 2.5 g/cm³
but density of water is 1 g/cm³
here it is clear that Density of object > density of water.

we know, from Archimedes principle, if density of an object is higher than density of liquid then, body will be sink in water.

so, the object will sink in water .

Answer 2

The given object volume V is 20cm³. The mass of object m is 50g.  

Then , the water density is mass/volume.

The density of given object is 50g/20cm³. We can get the answer as 2.5 g/cm³.

The given density of water is 1 g/cm³. It shows that the object density is greater than water density.

Based on the Archimedes principle, the object will sink in water.