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(a) A body weighs 10 N in air and 8 N when fully immersed in water. How much is the buoyant force acting on the body?
(b) Why are the buoys making the channel in a river are hollow spheres?

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Buoyant force `=10N-8N=2N`.
(b) Buoys float in water because each one can displace a weight of water greater than its own weight.

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