The weight of a solid object in air is measured as 43 N and

The weight of a solid object in air is measured as 43 N, and the weight of this same object in water at 20 degree C is measured as 33 N. Estimate the specific weight and volume of the object.

Solution

difference of weight = (difference of densities of water and air)xgravityxvolume

10 = (1000-1.17) x 9.8 x v

volume = 10/(1000-1.17)x9.8

volume = 10/9787.995

= 0.001 m3

specific weight = density x gravity

= (mass/volume) x gravity

= 43/0.001

= 4300kg/m2s2