Kognity IB Physics A.0 Measurements & Uncertainty (id: 0bf366a6f)

admin

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！

[填空题]
The radius of a circle of wire is p8 .i r4bs98h2/p ,hsbfs-zi lh1rg hqmeasuvwu;8w;8gjs( .k b-dr lm)zfnred to be 10.0 ± 0.5 cm.
What is the percentage error in the area of the loop?   %
What is the percentage error in the circumference of the loop?   %

参考答案:
空格1: 10.0  空格2: 5.0 


本题详细解析:
First calculate the percentage error in the radius of the loopw/ hg x8mwn13jxov5p: : $$ \frac{\Delta \mathrm{r}}{\mathrm{r}}=\frac{0.5}{10}=5 \% $$ The area of a circle is $A=\pi r^2$ and so the percentage error on the area of the loop will be twice the percentage error of the radius, $\Delta A=10 \%$.