Railways Technical Ability Fluid Mechanics and Machinery Question Bank Fluid Mechanics

  • question_answer The drag force D on a certain object in a certain flow is a function of the coefficient of viscosity p, the flow speed, V and the body dimension L (for geometrically similar objects); then D is proportional to:

    A) \[L\,\mu \,V\]                

    B) \[\frac{{{\mu }^{2}}{{V}^{2}}}{{{L}^{2}}}\]

    C) \[{{\mu }^{2}}{{V}^{2}}{{L}^{2}}\]                      

    D) \[\frac{\mu \,L}{V}\]

    Correct Answer: A

    Solution :

    \[L\mu V=\frac{m\times kg}{m\times s}\times \frac{m}{s}=kg.\text{m/}{{\text{s}}^{\text{2}}}=N\]

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