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

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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 measuredpoqvd0qa9q s w/:q;( ; r,qdox to be 10.0 ± 0xo7 z6xz9,x qc.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 btsy-k)c5w .ud -7e1c 3rw wqoloop: $$ \frac{\Delta \mathrm{r}}{\mathrm{r}}=\frac{0.5}{10}=5 \% $$ 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, $\Delta A=10 \%$.