Question

an object of mass 2 kg and density 8000 kg per metre cube is completely immersed in a liquid of density 800 kg per metre cube full stop find the force of buoyancy of it

Answer 1

the buoyancy force exerted by a liquid on an object dipped in it will be

F = ρgV

 

where ρ is the density of the liquid, V is th volume of the object immersed in the liquid and g is the acceleration due to gravity.

so,

here 

ρ = 800 kg/m3

g  =10 m/s2

and V = mass/density = 2/8000 = 2.5 X 10-4m3

 

thus,

F = 800 X 10 X 2.5 X 10-4 = 8 X 2.5 X 10-1

or

F/force of buoyance = 2N