The sign is attached to the post that is built-in at the ground. Treat the sign as having uniform mass. Neglect the contribution of the post weight. The length d is from the center plane of the sign to the center of the post. Take the sign dimensions to be h1 = 8.5 m, h2 = 1.5m, w = 3.5 m, and d = 400 mm. If the sign weighs 500 kg and the wind pressure is 2 {\rm kPa}, determine the internal loads acting along the x-directions at the base of the post.Determine the internal loads acting along the y-directions at the base of the post. Determine the internal loads acting along the z-directions at the base of the post.