A weightless rubber balloon is filled with 200 cc of water. Its weight in water is equal to:
✓ Correct answer: d) zero
ExplanationThe question is based on the principle of buoyancy, which means that an object fully or partly immersed in fluid experiences an upthrust or buoyant force equal to the weight of the fluid displaced.When a weightless balloon filled with water is immersed into water, it displaces an amount of water equivalent to its own volume, in this case, 200 cc.The weight of this displaced water in terms of gravitational pull is equal to the weight of the balloon under these conditions.Since both weights are identical (as the balloon is also filled with water), they cancel out each other, resulting in a net weight of the balloon in water to be zero.220
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