[填空题]
The radius of a circle lzf dmju2ry7 r474ci)p/as+ k of wire is measured to be 10.0 ± 0.)s rvyk4ao ts3x5i,wz2b*r/l27uh5a 0 cfjre5 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 3bu4 vaelw9p+ radius of the loop: $$ \frac{\Delta \mathrm{r}}{\mathrm{r}}=\frac{0.5}{10}=5 \% $$ 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, $\Delta A=10 \%$.
Post time 2024-8-21 21:38:19