т A thin sheet of fibreboard weighs 60 N and lies on a rooftop, as shown in the figure, where zo = 3 m, L = 1.5 m, and b

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т A thin sheet of fibreboard weighs 60 N and lies on a rooftop, as shown in the figure, where zo = 3 m, L = 1.5 m, and b = 2.4 m. The coefficient of solid friction between the board and the roof is o -0.1. Assume turbulent flow and consider the coefficient of friction, 0.027 C 0.5pU? Re! 1. What wind velocity (in m/s) will generate enough friction to dislodge the board? 2. What is the drag force in N) on the fibreboard when the wind speed is 20 m/s? 1/7 хо . 2 U m/s b Fibreboard Roof