[填空题]
The density of a solid p4g ys+cfja,q hpz*89b21a hjsphere is measured with per:uu 84isc6vfklaw */ dcentage uncertainty of 5%. The raus lwf6 v:4*c/8duak idius 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 cal+,asmk eo0g* kculated by multiplying its volume by the density of the material of which it is mamkea*s ko0+,gde: $$M=\frac{4}{3} \pi r^3 \rho$$ 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