28th November 2019

austincc
16

What is the uncertainty of a ruler?

Ruler A has an uncertainty of ±0.1 cm, and Ruler B has an uncertainty of ±0.05 cm. Thus, (a) Ruler A can give the measurements 2.0 cm and 2.5 cm. (b) Ruler B can give the measurements 3.35 cm and 3.50 cm. Figure 2.2 Metric Rulers for Measuring Length On Ruler A, each division is 1 cm.

Also know, what is the uncertainty of a micrometer?

Consider as an example the micrometer caliper shown in Figure 3. The screw of this instrument has 2 threads per millimeter so that it advances .5 mm for each revolution. Since there are 50 divisions around the rim, the least count and the uncertainty of this instrument is 1/50 x 0.5 mm = 0.01 mm.
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