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A 2-m-high, 4-m-wide rectangular advertisement panel is attached to a 4-m-wide, 0.15 m-high rectangular concrete block...

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Mechanical Engineering

A 2-m-high, 4-m-wide rectangular advertisement panel is attachedto a 4-m-wide, 0.15 m-high rectangular concrete block (density =2300 kg/m3) by two 5-cm-diameter, 4-m-high (exposedpart) poles, as shown in the figure. If the sign is to withstand150 km/h winds from any direction, determine (a) the maximum dragforce on the panel, (b) the drag force acting on the poles, and (c)the minimum length L of the concrete block for the panelto resist the winds. Take the density of the air to be 1.3kg/m3.

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