buoyancy and density：浮力密度

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1、BuoyancyandDensityMeasurethelength(incentimeters)ofahexagonalsideandanon-hexagonalsideofahexagon-shapedobject.Lengthofhexagonalside(cm)Lengthofnon-hexagonalside(cm)Thefiguresbelowshowhowapanbalanceworks.(Notethatitisanapplicationofthelawofthelever.)1.Notethe

2、panbalanceshouldbebalancedbeforestarting.2.Movingthesliderhastheeffectofaddingweighttotheright-hand-side.3.Addtheitemofunknownmasstotheleft-hand-side.4.Addknownmass(es)totheright-hand-sideandusetheslider(s)untilthescalebalancesagain.Addthemassplacedontherigh

3、t-hand-sidetotheslidermasstoobtainthedesiredmass.Useapan-balancescaletoobtainthemass(ingrams)ofoneofthehexagon-shapedobject(withtwohooks).Massofhexagon-shapedobject(grams)Havealargerbeakeronanangle(asshownbelow)andplaceasmallerbeakerunderitsspout.Fillthelarg

4、erbeakerwithwateruntilitbeginstospilloverintothesmallerbeaker.Pouroutanywaterthatspillsintothesmallerbeaker.Weighthehexagon-shapedobjectusingthespringbalanceasshownontheleftbelowandrecordthevalueinthetablebelow.Weightofthehexagon-shapedobject“inair”(N)Withth

5、ehexagon-shapedobjectstillonthespringbalance,loweritintothewatersothatasmuchofitaspossibleisunderwaterwithoutitlyingonthebottomofthebeakerasshownontherightabove.Recordthe“weightinwater”inthetablebelow.Weightofthehexagon-shapedobject“inwater”(N)Thedifferenceb

6、etweenweighingtheobjectinairandweighingitinwateristhatinwater,theobjectisbuoyedupbythewater.Inotherwords,thereisanadditionalforce,thebuoyantforce.(Strictlyspeakingthereisabuoyantforceinairaswell,butitismuchsmaller.)Nextpourthewaterfromthebeakerintoagraduated

7、cylindersothatwecanmeasuretheamountofwaterdisplacedbythehexagon-shapedobject(presumablyequaltothevolumeofthehexagon-shapedobjectitself).Volumeofwaterdisplaced(ml)Oneimportantfeatureofscientifictheoriesandscientificexperimentsisthattheyshouldbeself-consistent

8、.Inthecontextofthisexperiment,selfconsistencywillariseinthatwecandeterminethedensityofthehexagon-shapedobjectinafewwaysandthosedifferentvaluesshouldagree(withintheaccuracyoftheexperiment).Densit