Question

Question 52:
Calculate the density of an object of volume 3 m3 and mass 9 kg. State whether this object will float or sink in water. Give reason for your answer.

Lakhmir Singh Physics Class 9

Answer 1

Given : mass (m) = 9 kg and volume (V) = 3 m^3.
Therefore, density (d) = m/V = 9 kg / 3 m^3 = 3 kg/m^3.

The density of the object is 3 kg/m^3.

Since the density of water is 1 kg/m^3 and that of the object is 3 kg/m^3, the density of the object is greater than that of water. Hence, the object will sink.