Thrust exerted by an iron cuboid when placed on sand is equal to ______________.
Choose the correct option.

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Mass of cuboid

Mass per unit surface area

Weight of cuboid

The pressure exerted by the cuboid on the sand

answer is C.

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Detailed Solution

Thrust is the force acting normally on a surface.
Here the weight of the iron cuboid is nothing but the gravitational force that acts normal or perpendicular to the surface of the sand.
According to Newton's second law of motion, the force exerted on an object is equal to its mass multiplied by its acceleration. W=mg. Since the cuboid is at rest, its acceleration is zero. Therefore, the force exerted on the cuboid is simply its weight.
Therefore, we can say that thrust exerted by an iron cuboid when placed on sand is equal to the weight of the cuboid.

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