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You drop a spherical marble into a viscous fluid such as jam. The viscosity of the...

You drop a spherical marble into a viscous fluid such as jam. The viscosity of the jam is η=20 Pa.s and the densities of the marble and the jam are 2600 and 1400 kg/m3, respectively. The radius of the marble is 0.5 cm. The marble quickly reaches terminal speed due to the interplay of 3 forces: its weight, the buoyant force and the viscous force (assume Stokes’ law).

Calculate the terminal speed of the marble

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