Railways Technical Ability Fluid Mechanics and Machinery Question Bank Fluid Mechanics

  • question_answer A skater weighing 1000 N skates at a speed of 20 m/s on ice maintained at \[0{}^\circ C.\] the average skating area supporting the skater is \[0.001\,{{m}^{2}}\] and the coefficient of friction between the skatesandice is 0.02. What will be the average thickness of a film of water existing at the interface between the skater and ice? (Take dynamic viscosity of water as \[0.001\,\text{Ns/}{{\text{m}}^{\text{2}}}\])

    A) \[{{10}^{-5m}}\]

    B) \[{{10}^{-6}}\]

    C) \[{{10}^{-2}}\]

    D) Not possible to estimate since there cannot be a possibility, of formation of a thin film of water at interface

    Correct Answer: A

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