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26 Nov 2019
Obtain an overflow can with a short metal tubeextendingoutward a bit below the top of the can. Place the overflowcan on alab jack set at its lowest position. Place a plastic beakernext tothe overflow can so that the plastic beaker will catch anywaterthat overflows. Fill the overflow can until waterstartsoverflowing into the plastic beaker, but donât let toomuchwater overflow. Once water has stopped overflowing carefullyremovethe plastic beaker making sure not to disturb the overflowcan andweigh the plastic beaker. Record the plastic beakerâsweightand then place it back beside the overflow can. (Recordweights asmass times g where mass is measured in kilograms and g =9.8m/s2.)
Mount a scale on top of a small ring stand. You should findacylindrical slot on the underside of the scale. Pick a metalblockof any material and hang it with a string (about 6 to 8incheslong) from the metal support at the bottom of the scale thatisdirectly connected to the scaleâs balance pan (the flathorizontalcircular surface where you usually place objects tomeasure theirmass). With the metal block hanging from the scaledetermine themass of the metal block by balancing the scale.
Carefully move the scale so the metal block is directlyoverthe overflow can and very slowly raise the lab jack so thatthemetal block becomes submerged. Water will overflow into theplasticbeaker. Once water has stopped overflowing re-weigh theplasticbeaker. Also, you will notice that the scale is no longerbalanced.Balance the scale to determine the apparent weight of themetalblock. This âweightâ is really equal to the actualweight minusthe buoyant force. From the change in weight of theblock calculatethe buoyant force. Also, from the change in weightof the plasticbeaker calculate the weight of the water displaced.Should theseweights be equal? Compare their values by calculatinga percentdifference. In part I your instructor may have asked you to use agraduatedcylinder instead of the overflow can. Explain themeasurements thatyou made and how those measurements lead you toconclude thatArchimedesâ Principle is correct.
Obtain an overflow can with a short metal tubeextendingoutward a bit below the top of the can. Place the overflowcan on alab jack set at its lowest position. Place a plastic beakernext tothe overflow can so that the plastic beaker will catch anywaterthat overflows. Fill the overflow can until waterstartsoverflowing into the plastic beaker, but donât let toomuchwater overflow. Once water has stopped overflowing carefullyremovethe plastic beaker making sure not to disturb the overflowcan andweigh the plastic beaker. Record the plastic beakerâsweightand then place it back beside the overflow can. (Recordweights asmass times g where mass is measured in kilograms and g =9.8m/s2.)
Mount a scale on top of a small ring stand. You should findacylindrical slot on the underside of the scale. Pick a metalblockof any material and hang it with a string (about 6 to 8incheslong) from the metal support at the bottom of the scale thatisdirectly connected to the scaleâs balance pan (the flathorizontalcircular surface where you usually place objects tomeasure theirmass). With the metal block hanging from the scaledetermine themass of the metal block by balancing the scale.
Carefully move the scale so the metal block is directlyoverthe overflow can and very slowly raise the lab jack so thatthemetal block becomes submerged. Water will overflow into theplasticbeaker. Once water has stopped overflowing re-weigh theplasticbeaker. Also, you will notice that the scale is no longerbalanced.Balance the scale to determine the apparent weight of themetalblock. This âweightâ is really equal to the actualweight minusthe buoyant force. From the change in weight of theblock calculatethe buoyant force. Also, from the change in weightof the plasticbeaker calculate the weight of the water displaced.Should theseweights be equal? Compare their values by calculatinga percentdifference.
In part I your instructor may have asked you to use agraduatedcylinder instead of the overflow can. Explain themeasurements thatyou made and how those measurements lead you toconclude thatArchimedesâ Principle is correct.
30 Jun 2023
