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  4. A drop of water of radius r is falling through the air of coefficient of viscosity 'η' with a constant velocity o f 'v'. The resultant force on the drop is

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Q. A drop of water of radius "r" is falling through the air of coefficient of viscosity $'\eta' $ with a constant velocity o f 'v'. The resultant force on the drop is

Mechanical Properties of Fluids

Solution:

When a drop is falling at constant velocity, viscous force is balanced by weight, hence resultant force is zero.