Question: The data in Fig P7.108 are for lift and drag of a spinning sphere from Ref. 12, pp. 720. Suppose a tennis ball (W ≈

The data in Fig P7.108 are for lift and drag of a spinning sphere from Ref. 12, pp. 7€“20. Suppose a tennis ball (W ≈ 0.56 N, D ≈ 6.35 cm) is struck at sea level with initial velocity Vo = 30 m/s, with €œtopspin€ (front of the ball rotating downward) of 120 rev/sec. If the initial height of the ball is 1.5 m, estimate the horizontal distance travelled before it strikes the ground.

The data in Fig P7.108 are for lift

0.70 0.60- CD 0.50-Laminar 0.40 CL 0.30 CL Turbulent 0,20 Turbulen CD 0.10 Laminar 0.00 -0.10 0.0 1.0 2.0 3.0 4.0 5.0

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