# Devoir

Pages: 2 (473 mots) Publié le: 17 février 2010
Purpose

The purpose of this experiment is to get to know how to use the measuring devices and to learn the method by which the measurements are made and to learn how to determine a density andspecific gravity of a body.

Procedure

First, using a ruler we measure the length, width and height of theiron block, we find L= 3.15 cm W=5.15 cm and H=3.15 then we measure the mass of it which is m=247.5 g. Now we calculate the volume of the block using our measurements with the following formula:V=L.W.H=31.2 cm^3. Then we calculate the density using the formula: m/v=7.93 then we look up the standard value of the density of iron: 7.86 cm^3. We then calculate the percent error in our value of thedensity: % error= (Pcalc-Pstan)/Pstan . 100=0.89%.
Using the vernier caliper we measure the diameter of the aluminum cylinder in 3 different places 1.89 cm, 1.92 cm and 1.91 cm butbefore that we must record the zero reading, ours is 0.00 cm. then we add our results we get 5.72 then divide it by 3 to get the average diameter which is 1.91 cm, we deduct from it our zero reading westill get 1.91 cm. then we do the exact same procedure but by measuring the length this time. Our results are: our readings : 4.42 cm, 4.41 cm and 4.41 cm, our sum is 13.24 cm, minus our zero reading westay at 4.41 cm.
We now measure the diameter and length with a ruler we find D=1.90 and L=4.40 the difference between the vernier caliper and ruler for both diameter and length is 0.01 cm. Now usinga triple-beam balance we measure the weight of the cylinder we find 37.4 grams. Using the diameter from step 9 and length from step 10 and the formula: V=(π.d^2.L)/4= 12.6 cm^3. We then calculatethe density: Pcalc=m/v=2.96 g/cm^3. Pstan= 2.70 g/cm^3. We calculate the percent error and we find 9.63%.
Now Archimedes’ method we check the overhead balance to see if it’s at...

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