Kognity IB Physics A.0 Measurements & Uncertainty (id: 420102d71)

[单选题]
The length of a pencil is measured us4 bqbb:bx+a3krgz3d.qq8 u w/ing part of a metre rule that vml 7xss m:gd-8c od26is graduated in2clgodx8v -s: mds76m millimetres, as shown below.

What is the length of the pencil?

A. $(6.00 \pm 0.10) \; cm$
B. $(6 \pm 0.1) \; cm$
C. $(6 \pm 0.05) \; cm$
D. $(6.00 \pm 0.05) \; cm$


参考答案:  A


本题详细解析:
With a millimetre scale we can take each readievyy7b ubv n2wn8mq0 38t5k-fms0 vrgs9y04jng to ±0.5mm, following the rule that the uncertainty is half the smallest division. So when we subtract our two readings to get the length of the pencil, we have to add the absolute uncew n0b jbkgyme-4sm0 fv5qvnt73v0y 9rs82y 8 urtainties, giving 0.10cm. The length must be presented to the same number of decimal places as the uncertainty.