The terminal velocity of a copper ball of radius 5 mm falling through a tank of oil at room temperature is 10 cm s$-$1. If the viscosity of oil at room temperature is 0.9 kg m$-$1 s$-$1, the viscous drag force is :

Question

The terminal velocity of a copper ball of radius 5 mm falling through a tank of oil at room temperature is 10 cm s^$-$1. If the viscosity of oil at room temperature is 0.9 kg m^$-$1 s^$-$1, the viscous drag force is :

4.23 $\times$ 10^$-$6 N

8.48 $\times$ 10^$-$3 N

8.48 $\times$ 10^$-$5 N

4.23 $\times$ 10^$-$3 N

Solution

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