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 9.5hkj9d1 lfac *pgt u+q) 5e;h-z ± 0.2 cm long 6hfd-s:k y)be 7dm* tuudqd(9is cut from a longer piece that is 12.6 ± 0.2 cm long. How long is tm) qdke9td7d ( : sdyhuu6b-f*he 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:
$y=a-b=12.6-9.5=3.1 \mathrm{~cm}$ $\Delta y=\Delta a+\Delta b=0.2+0.2=0.4 \mathrm{~cm}$
| 
Post time 2024-8-21 21:38:19