The figures below show that a submarine can either sink or float even though the upthrust acting on it is the same. What is the relationship between the weight of submarine and the upthrust when the submarine sinks in water?

Weight of submarine < Upthrust.

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Weight of submarine = Upthrust.

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Weight of submarine > Upthrust.

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Weight of submarine $\leq$ Upthrust.

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Solution

The correct option is C
Weight of submarine > Upthrust.

To increase it's weight to overcome the upthrust, the ballast tanks of the submarine are flooded with water and the air in the ballast tanks is vented from the submarine until its overall density is greater than the surrounding water and the submarine begins to sink.

So, the relationship = Weight of submarine > Upthrust.

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