Consider a large rock situated at the bottom of a river and acted on by a strong current. Estimate a typical speed of the current that will cause the rock to move downstream along the bottom of the river. List and justify all assumptions. Show all calculations and work in SI units. Use Table 11.1 in §11.3.

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TABLE 11.1 Approximate Cp Values for Various Bodies Type of Body Length Ratio Co Re Rectangular plate Vb = 1 >10 >10 1.18 Ub = 5 1.20 Ub = 10 >10 >10 >10 1.30 Ub = 20 1.50 Ub = 00 1.98 Circular cylinder with axis parallel to flow Ud = 0 (disk) Ud = 0.5 >10 >10 >10 1.17 - O)) 1.15 Ud = 1 0.90 Ud = 2 >10 >10 >10 0.85 Ud = 4 0.87 Ud = 8 0.99 Square rod >10 2.00 Square rod 1.50 >10 60 Triangular cylinder >10 1.39 - Semicircular shell >10 1.20 - Semicircular shell >104 2.30 - Hemispherical >10 0.39 Hemispherical shell >10 1.40 Cube - >10 1.10 Cube >10 0.81 - Cone-60 vertex >10 0.49 Parachute 3 X 10" 1.20 8 8 8