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A boat of area  floating on the surface of a river is made to move horizontaly with a speed of  by applying a tangential force. If the river is  deep and the water in contact with the bed is stationary, what is the tangential force needed to keep the boat moving ? (viscosity of water 0.01 poise)

  1. 0.04 N
  2. 0.05 N
  3. 0.02 N
  4. 0.03 N

The correct answer is: 0.02 N

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