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# Physics lab - density

Extracts from this document...

Introduction

Raw Data and Data Processing

 Table 1 Material Massm/g∆m = ± 0.1g Volumev/cm3∆v = ± 0.35cm3 Densityρ/g cm-3∆ρ = ± 0.35 g cm-3 Iron block 251.7 3.0 x 101 8.4 Copper cylinder 57.40 7.0 8.0

Sample calculation for density (shown for iron block):

Mass/g = (251.7 ± 0.1)g

Relative uncertainty =  =  = 3.972983711 x 10-4  = 4 x 10-4

Therefore,

Mass/g = (251.7 ± 4 x 10

Middle = 0.032258064

As we are finding the volume, we need to add the uncertainties of all the measurements, i.e. length, width and height. In this case the material was a cube, where the measurements were the same and even the uncertainties, thus we can multiplied the uncertainty by 3, i.e.

0.032258064 x 3 = 0.0967741935

When converted in percentage we get: 9.677% ≈ 10%

Volume = 3.1cm x 3.1cm x 3.1cm   = 29.791 cm3

Conclusion

ρavg =  =  =  2.9 g cm-3

ρavg =  =  =  = 0.25 g cm-3

ρavg ±  ρavg = (2.9 ± 0.25) g cm-3

Thus, the average density is equal to the gradient of the black line in the graph. The other two lines show the minimum (red line) slope of the density and the maximum (green line). It is not necessary that their average will be the slope of the black line.

This student written piece of work is one of many that can be found in our International Baccalaureate Physics section.

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