Question

4. A piece of plastic floats in water. The buoyant force acting on the piece is
(a) zero
(b) more than weight of the piece
to less than the weight of the piece (d) equal to the weight of the piece​

Answer 1

Answer:

More than the weight of piece.

Explanation:

Density of plastic block is less than the density of water. Thus, when it floats, it is partially immersed in water such that its weight gets balanced with the buoyant force acting on it. When it is put completely in water, buoyant force on it becomes more than its weight. Thus, when it is released, it comes up to the surface of the water due to a net upward force acting on it.

Answer 2

d.equal to the weight of the piece

Explanation:

If the buoyant force equals the object's weight, the object will remain suspended at that depth. The buoyant force is always present whether the object floats, sinks, or is suspended in a fluid. Archimedes' principle states that the buoyant force on an object equals the weight of the fluid it displaces.

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