Hasil (
Bahasa Indonesia) 1:
[Salinan]Disalin!
With the analysis of the student extracts, it was found that some ideas near to the correct answer of the question were given. “There will be a slight (unimportant) difference at the weight of the jar when the flies fly and on the bottom. But in the capped jar, if the flies are flying, the weight of the jar will be the same as the one when they are at the bottom of the jar. Weight depends on the mass inside and it doesn’t change; since the weight of is transmitted to the bottom of the jar thanks to air currents. In particular, an upward pull is formed thanks to the wings of the flies. But there must be a reply for this upward pull of the air. The things to pay attention is that the force value that the air will have when it is at the bottom of the jar will be bigger than that of the one at the top, because when the air strikes at the bottom it moves faster and in return “friction” decreases the speed of the air before it strike at the top (there is a friction because there is an air inside as the flies can fly). The difference at the bottom and top forces will be equal to the weight of the flies (we can liken it to the example of “the fish swimming in the aquarium”) The Answer: (c)”.
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