Civil and Environmental Engineering Answers

A traffic light and signal pole is subjected to the weight of each the weight of traffic signal W_s = 45 lb and the weight of the road lamp W_L = 55 lb. The pole is fixed at the base. Find the principal normal stresses and the maximum shear stress on element B located 19 ft above the base (see figure). Assume that the weight of the pole and later arms is included in the signal and lamp weights. [Ans. sigma_max = 2689 psi]

Determine the horizontal and vertical components of reaction on the member at the pin A, and the normal reaction at the roller B.

determine the force P required to maintain the 200 kg engine in the position for which theta = 30 degree. The diameter of the pulley at B is negligible.

A 24.72 meter distance will be laid out using a 50 m tape that is .12 m too long. Where on the tape would you put the mark in order to layout the required 24.72 meter?

A ball is projected at such an angle that the horizontal range is three times

the maximum height. What is the angle of projection?