It is easy to pull the bucket as long as it is inside water, but as soon as it starts coming out of the water, it appears to become heavy because of

upthrust

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the change in density of the bucket in water.

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the surface tension of water.

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the viscosity of water.

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Solution

The correct option is A
upthrust

It is due to the buoyant force/upthrust exerted by a liquid that the weight of an object appears to be less in the fluid than its actual weight. Therefore, it is easy to pull the bucket as long as it is inside water, but as soon as it starts coming out of the water, it appears to become heavy.

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