Question: A 2-m-high, 4-m-wide rectangular advertisement panel is attached to a 4-m-wide, 0.15-m-high rectangular concrete block (density 5 2300 kg/m3) by two 5-cm-diameter, 4-m-high (exposed part)

A 2-m-high, 4-m-wide rectangular advertisement panel is attached to a 4-m-wide, 0.15-m-high rectangular concrete block (density 5 2300 kg/m3) by two 5-cm-diameter, 4-m-high (exposed part) poles, as shown in Fig. P15€“88. If the sign is to withstand 150 km/h winds from any direction, determine

(a) The maximum drag force on the panel,

(b) The drag force acting on the poles,

(c) The minimum length L of the concrete block for the panel to resist the winds. Take the density of air to be 1.30 kg/m³.

4 m 2 m ADVERTISE HERE 4 m Concrete 4 m 0.15 m

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