Question 306: Properties of Matter

Question

The viscous drag acting on a metal sphere of diameter $$1 \mathrm{~mm}$$, falling through a fluid of viscosity $$0.8 \mathrm{~Pa}$$ s with a velocity of $$2 \mathrm{~m} \mathrm{~s}^{-1}$$ is equal to :

Accepted Answer

$$
\begin{aligned}
& F=6 \pi \mathrm{r} \eta v \
& =(6)(3.14)\left(\frac{1 	imes 10^{-3}}{2}ight)\left(0.8 	imes 10^{-1}ight)(2) \
& =1.5 	imes 10^{-3} \mathrm{~N}
\end{aligned}
$$

Answer

$$15 	imes 10^{-3} \mathrm{~N}$$

Answer

$$30 	imes 10^{-3} \mathrm{~N}$$

Answer

$$1.5 	imes 10^{-3} \mathrm{~N}$$

Answer

$$20 	imes 10^{-3} \mathrm{~N}$$

Properties of Matter

The viscous drag acting on a metal sphere of diameter $1 \mathrm{~mm}, falling through a fluid of viscosity 0.8 \mathrm{~Pa} s with a velocity of 2 \mathrm{~m} \mathrm{~s}^{-1}$ is equal to :

Choose the correct answer: