Question

The block of ice (temperature 0°C) shown in the figure below is drawn over a level surface lubricated by a layer of water 0.10 mm thick. Determine the magnitude of the force  needed to pull the block with a constant speed of 0.49 m/s. At 0°C, the viscosity of water has the value η = 1.79  10-3 N · s/m2.
 N

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