A block of weight $ W $ is floating in water, and one-third of the block is above the surface of the water. Which of the following correctly describes the magnitude $ F $ of the force that the block exerts on the water and explains why $ F $ has that value?

Question

A block of weight $ W $ is floating in water, and one-third of the block is above the surface of the water. Which of the following correctly describes the magnitude $ F $ of the force that the block exerts on the water and explains why $ F $ has that value?(a) $ F = \dfrac{2}{3} W $. Only two-thirds of the block is in contact with the water, so it will exert a force on the water equal to two-thirds of the block’s weight.
, (b) $ F = \dfrac{2}{3} W $. The water exerts a force on the block equal to the weight of the part of the block that is underwater. The block then exerts a force of equal magnitude on the water.
, (c) $ F = W $. The block is at rest, so the net force on it must be zero. The water must exert an upward force of magnitude $ F $ on the block to make this so. The block then exerts a force of equal magnitude on the water.
, (d) $ F = W $. Any object will always exert a force on the surface beneath it that is equal to the weight of the object.
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