Question

1. How can an aircraft carrier (or a concrete canoe) float when the density of the material used to build it is greater than the density of water?
2. Does air create a buoyant force? If so, estimate the magnitudes of the buoyant forces due to the atmosphere on your wood and aluminum cylinders?
3. Is the direction of the buoyant force always opposite the direction of the gravitational force?
4. Does the buoyant force on a totally submerged object change as the object moves farther and
farther below the surface of the fluid?

Answer 1

Answer 1)

Let B be the buoyant force

W be the weight of the aircraft

So,

B = rho*v*g

Where,

rho = density of water

v =volume of water displaced by the aircraft

g = accelaration due to gravity

We know, greater is the volume of the aircraft , greater volume of water is displaced , hence more buoyant force

So, as long as B > = W, the aircraft will float

If B< W,then it will automatically sink

Since , aircfraft ensures large volume ,so buoyant force will be more than weight . Hence, it will floats.

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