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Finding downward force on immersed object
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[QUOTE="haruspex, post: 6866788, member: 334404"] No, the reading would be mg-B. Without the water there is no buoyancy, B=0, and the reading is mg. I have no idea why the TA is naming the reading ##F_i##, or why you think it has anything to do with the diagram in post #3. Nothing in the print image refers to ##F_i## or ##F_j##. That seems to be a confusion of your own. That image is entirely irrelevant to your experiment for reasons I already gave. That suggests to me that the TA is distinguishing the upward force the net exerts on the objects (and naming [I]that[/I] ##F_i##) from the force reading on the sensor, T. The difference would be the weight of the cable and net, less the buoyant force on the submerged part of the net. It's not that T=0, but that the difference between T and ##F_i## would be extremely small. Hence, you are to use the reading as though it is ##F_i##. Turning to your table of results, I presume that each row corresponds to a different object or collection of objects, so the densities can be quite different. That being the case, I see no way to evaluate the experimental results. There ought to be another column identifying the object. You should not show so many significant figures in the density column. At most, the number of them should be the lower of those in the first two columns; mostly that's three. But given the subtraction in the formula, even that may be too many. I'll explain why in a later post. [/QUOTE]
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Finding downward force on immersed object
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