PARAPPAP PAPPA?

I’m hating it

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PROCEDURES

EXPERIMENT 5 – ARCHIMEDES’ PRINCIPLE

DETERMINING DENSITY OF METAL BLOCK

1. A regular shaped metal block is used. We use this instead of an irregular shaped object to make it easier for us to measure it’s dimension and calculate it’s volume.

2. An electronic balance was used to determine the mass of the metal block, with uncertainty.

3. A vernier caliper was used to measure the dimensions of the metal block that we selected. It’s volume was calculated by using the appropriate formula for volume calculation of a cube. After that the density of the metal block was computed together with it’s uncertainty. This is the direct measurement value.

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4. For determining the density of metal block by using Archimedes’ principle, the apparatus was set up as shown in Figure 1 on the left.

5. The weight of the metal block in the air was measured by using Newton’s balance.

6. The beaker was filled enough with tap water. The position of the metal block which was hanged on top of the beaker was adjusted until the metal block is fully submerged under water.. Figure 1

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7. The weight of the metal block in the water (apparent weight) was found out while making sure our eye sight was perpendicular to the Newton’s balance while reading the weight.

8. By applying Archimedes’ principle, knowing that the volume of water displaced equal to the volume of the metal block, and by using back the mass from step 2, the density of the metal block with it’s uncertainty was determined.

9. The percentage difference between the results of direct measurement and Archimedes’ principle was calculated. Conclusions were given.

DETERMINING DENSITY OF PARAFFIN OIL

1. To determine the density of paraffin oil, the tap water in the beaker just now was replaced with paraffin oil (of course!).

2. The experiment was repeated by hanging the same metal block on top of the beaker, measuring it’s weight in air and then by submerging it completely in the paraffin oil.

3. The density of the paraffin oil is calculated along with it’s uncertainty. The density is given by the difference between the Newton’s balance reading before and after the immersion of the metal block(buoyancy force); divided by the volume of the metal block (which we already knew) times gravitional force, g which is equal to 9.81 ms -2.

4. The percentage error between this experiment’s result with the standard density of paraffin given in Table 1 in the Post-Lab Questions sections was calculated. Conclusions were stated.

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