[填空题]
The density of a solid sphere is measured with percentage uncertainty o*vcw5-.thb d tf 5%. +dkevt39r ie0-iaxg 5The radiurd-5tk30i vx9+ia gees of the sphere is 4.0 ± 0.2 cm. What is the percentage uncertainty in the mass of the sphere? % (Please do not include the % simbol in the blank)
参考答案: 20.0
本题详细解析: The mass of the sphere can be calculated by multiplying ilasz854bokz)/2y8mx;m ew cr ts volume by the densitzc4kb e l wx5 );82/o8zmmasyry of the material of which it is made: $$M=\frac{4}{3} \pi r^3 \rho$$ so the percentage uncertainty in $M$ is $$\frac{\Delta M}{M}=3 \frac{\Delta r}{r}+\frac{\Delta \rho}{\rho} .$$ The percentage uncertainty in $r$ is $5 \%$, so the percentage error in $M$ is $(3 \times 5 \%)+5 \%=20 \%$
Post time 2024-8-21 21:38:19