The supporting structure of the billboard is attached to the ground by a pin at B, and its rear leg rests on the ground at A. Friction may be neglected. Point G is the center of gravity of the billboard of the structure, which together has a mass of 14?. The wind load on the billboard is ? = 1500 ?⁄?. To prevent tipping over in high winds, a 1500 ?? mass is placed on the structure near A as shown in the figure. Determine the following: (a) the diameter of the pin at B for which the allowable shearing stress in the pin is 100 MPa, (b) the corresponding bearing stress in the bracket at B.

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Wind Energy

Wind energy is a renewable energy source that is used to generate electricity by wind power. The term, wind power, means utilization of kinetic energy of wind to generate electricity. Wind energy is termed renewable source energy because it can never be exhausted. There are other renewable energy sources, such as solar energy, geothermal energy, hydropower energy, and so on. All of them contribute to power the thermal energy stations to generate electricity.