本题目来源于试卷: Kognity IB Physics A.0 Measurements & Uncertainty，类别为 IBDP Physics
本题为动态变量类型，下面题目描述与解答中出现的数值不同于您在作答时遇到的数值！
[单选题]
A piece of string 9.5 ± -2c zmspe:71s hk : gufgc;ev60.2 cm long is cut from a longer piece that z9 nldamv;q o-v117v pis 12.6 ± 0.2 cm longav mpv 7zn1v1lqo-d;9. How long is the remaining piece of string?
A. $3.1 \pm 0.2 \; cm$
B. $3.1 \pm 0.3 \; cm$
C. $3.1 \pm 0.4 \; cm$
D. $3.1 \pm 0.5 \; cm$
参考答案: C
本题详细解析:
$y=a-b=12.6-9.5=3.1 \mathrm{~cm}$ $\Delta y=\Delta a+\Delta b=0.2+0.2=0.4 \mathrm{~cm}$
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Post time 2024-8-21 21:38:19