Discussion
An oil of dynamic viscosity 0.18 Pa\( \cdot \)s and density 900 kg/m\( ^3 \) has a kinematic viscosity of
Answer: C
Correct answer: 200 cSt
Kinematic viscosity is dynamic viscosity divided by density: \[ \nu = \frac{0.18}{900} = 2 \times 10^{-4}\ \mathrm{m^2/s}. \] One centistokes is \( 10^{-6}\ \mathrm{m^2/s} \), so this is 200 cSt. Multiplying rather than dividing gives 162, which is one of the distractors.
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