Question: Two steel balls (SG = 7.86) are connected by a thin hinged rod of negligible weight and drag, as shown in Fig. P7.99. A stop

Two steel balls (SG = 7.86) are connected by a thin hinged rod of negligible weight and drag, as shown in Fig. P7.99. A stop prevents counterclockwise rotation. Estimate the sea-level air velocity U for which the rod will first begin to rotate clockwise.

D 2 cm 10 cm Hinge Stop-- 45" 10 cm D# 1 cm

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