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D e a r S t u d e n t, G i v e n, d = 6 m m = 0.6 c m, r = \frac{d}{2} = 0.3 c m ρ_{b a l l} = 10 g / c m^{3}, ρ_{m u s t a r d} = 2 g / c m^{3}, v_{t} = 8 c m / s g = 9.8 m / s^{2} = 980 c m / s^{2} (A l l t h e u n i t s a r e t a k e n i n C G S a s p o i s e i s t h e u n i t o f c o e f f i c i e n t o f v i s \cos i t y i n C G S s y s t e m .) W e h a v e t e r m i n a l v e l o c i t y a s, v_{t} = \frac{2 r^{2} (ρ_{b a l l} - ρ_{m u s t a r d}) g}{9 η} \Rightarrow C o e f f i c i e n t o f v i s \cos i t y o f m u s t a r d o i l i s, η = \frac{2 r^{2} (ρ_{b a l l} - ρ_{m u s t a r d}) g}{9 v_{t}} = \frac{2 \times 0.3 \times 0.3 \times (10 - 2) \times 980}{9 \times 8} = \frac{1411.2}{72} = 19.6 p o i s e, O p t i o n A R e g a r d s .

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