From Facebook: someone please help. The answers seem to be widely varying.... @InertialObservr @starstrickenSFpic.twitter.com/HNV4x7hplO
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Others are right, it’s 1.5 kg. I forgot that a completely submerged object displaces volume not weight
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Be nice to have more information about normal forces acting on the system. Is the ensemble in freefall? On Earth's surface? Ganymede's? Is it suspended from a ceiling or a wall? Is it on an incline?
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If we're assuming the scales are calibrated correctly, it wouldn't matter (except for free fall, but then the mass of the entire system would still be 1,5kg)
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It all comes down to Newton's third law, the same would happen with a floating magnet (repulsive downward force) or a floating balloon, boiling water... (change in pressure).
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Correct answer, but it's not a buoyancy effect, it's an aerodynamic effect. Wings cause a change in fluid stream momentum (ṁ_air * ΔV_air = m_fly * g) and the jar opposes it. It appears as an unbalanced pressure force inside the jar.
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I mean if the jar flies system is 1.5 kg, they’re 1.5kg.
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I explained it to myself by replacing the flies with water vapor, which makes it clearer to me. In a way the flys are just particulates of a suspended gas here, so they just go into the mass.
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