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course Phy 241
10/5 11
Questions about lab`qx001. Most of you found that the period of motion for the balance when the large paperclip was suspended in water was less than that for the straightened small paperclip. What were the two periods, and what was the ratio of the two?
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I did not gather data regarding the period of the 2 different paper clips????
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`qx002. Which system experiences the greater change in buoyant force when the clip goes a centimeter deeper.
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It would have to be large paper clip from what I gathered. This would probably be related to large paper clip being curled and having more surface area??????
Right, but more cross-sectional area, not more surface area.
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`qx003. Give your best explanation why you would expect the system with the large suspended paperclip to have the shorter period.
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I missed this part of class, but if large paper clip was curled or even just larger in relation to surface area then the more surface area the greater area for the buoyant force to be exerted.
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`qx004. Speculate on whether the period of motion would remain constant through several cycles, if instead of a paperclip or wire the suspended object was a thin metal cone. What difference would it make if the cone was suspended from its apex as opposed to its base? What if instead of a cone the suspended object was a sphere? These are big open questions that can easily go beyond the scope of this course so don't spend an inordinate amount of time thinking about them, but do give the cone some thought. Hint: how would the buoyant force change with the depth to which the object is suspended in the water?
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The further the cone was inserted into the water the larger the surface area exposed to the buoyant force. If this is so then the buoyant force would be greater and greater as the cone went deeper into the water.
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Good. See my note about cross-sectional area vs. surface area, but right ideas throughout.
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