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The terminal velocity of a copper ball of radius \( 2.0 \mathrm{~mm} \) falling through a tank of oil at \( 20^{\circ} \mathrm{C} \) is \( 6.5 \mathrm{cms}^{-1} \). Compute the viscosity of the oil at \( 20^{\circ} \mathrm{C} \). Density of oil is \( 1.5 \times 10^{3} \mathrm{kgm}^{-3} \) and density of copper is \( 8.9 \times 10^{3} \mathrm{~kg} \mathrm{~m}^{-3} \).
(a) \( 1 \times 10^{-1} \mathrm{~kg} \mathrm{~ms}^{-1} \)
(b) \( 9.9 \times 10^{-1} \mathrm{~kg} \mathrm{~ms}^{-1} \)
(c) \( 24.3 \times 10^{-2} \mathrm{~kg} \mathrm{~ms}^{-1} \)
(d) \( 2 \times 10^{-2} \mathrm{~kg} \mathrm{~ms}^{-1} \)
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