Question: Air flows past two equal sized spheres ( one rough, one smooth ) that are attached to the arm of a balance as is indicated.

Air flows past two equal sized spheres (one rough, one smooth) that are attached to the
arm of a balance as is indicated. With U =0 the beam is balanced. What is the minimum air
velocity for which the balance arm will rotate clockwise?
Answer: 10.2 m/s

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