Question

if the same volume of lead and iron is immersed in water,then do they experience the same buoyant force?

Answer 1

In this case, with the volume of both the objects being equal, the buoyant force on either of them will be the same, provided you're using the same fluid and carrying out the experiment in one particular strata of the Earth's atmosphere (haha!). The buoyant force on an object depends on first, the gravitational acceleration (which I am assuming you’re maintaining the same), that is 9.8 metres per second squared, second the Volume of the object, which as you mentioned is equal and third, the density of the fluid used. Force of buoyancy = Gravitational acceleration*Density of the fluid*Volume of the object [Archimedes Principle]. With all the 3 components being equal in magnitude in the two cases, the Buoyant force is hence equal