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Problem 4. A cork ball (SG = 0.21) with a diameter of D = 0.30 m is tied to an object on the bottom of a river as shown.
(a) For an angle of 3 = 30°, estimate the speed of the river current neglecting the weight of the cable and the drag on it.
(b) Briefly discuss how the angle changes for a range of speeds from 0.4 m/s to 10 m/s.
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Problem 4. A cork ball (SG = 0.21) with a diameter of D = 0.30 m is tied to an object on the bottom of a river as shown. (a) For an angle of 3 = 30°, estimate the speed of the river current neglecting the weight of the cable and the drag on it. (b) Briefly discuss how the angle changes for a range of speeds from 0.4 m/s to 10 m/s.

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