Posted: 23 July 2005 at 4:37pm  IP Logged



Performing all calculations in SI :
Volume of M = 0.1 m 0.1 m 0.1 m = 0.001 m
Mass of M = 0.001 m 5000 kg/m = 5 kg
Weight of M = 5 kg 10 m/s = 50 N
This is the normal weight of M. Underwater, buoyant force pushes upwards and reduces its weight. According to Bernoulli's principle, magnitude of buoyant force equals the weight of the displaced liquid. Hence :
Volume of displaced water = Volume of M = 0.001 m
Mass of displaced water = 0.001 m 1000 kg/m = 1 kg
Weight of displaced water = 1 kg 10 m/s = 10 N
Buoyant Force = Weight of displaced water = 10 N
Therefore the normal weight of M is reduced by 10 N.
The measured weight = 50 N  10 N = 40 N
