Two Spheres Are Made of Wood-The First Is of a Variety

question 3

Multiple Choice

Two spheres are made of wood-the first is of a variety of wood whose density is equal to that of water, while the second is of a variety whose density is greater than that of water. These spheres have the same volume, and the first remains wherever it is placed in the water (so it is effectively suspended in mid-water) . The second rests on the bottom, being more dense than water. Compare the buoyant forces on the two spheres.

• A) Nothing specifically can be concluded without knowing exactly the densities of the spheres.
• B) They are identical
• C) The force on the second is zero, and therefore less than that on the first, which is non-zero.
• D) The force on the second is non-zero and is less than that on the first.

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