2. A three-link system is subjected to a vertical displacement at point A as shown below. Each bas has cross-sectional area A and elastic modulus E. Determine the vertical load at point A. 30° L Figure 2 Simple three-link structure

A gymnast with a mass of m = 40 kg is hanging by one hand from the middle of a simply supported beam with a length L = 1.5 m. The beam has a cross-sectional area of A = 4 cm² and a Young's modulus of E = 15 GPa. a. What are the maximum deflection and maximum stress in the beam if it has a circular cross section? b. If it has a square cross section? c. If it has a hollow cross section with a wall thickness t = 0.5 cm? d. Which is the greatest and least and why? L L/2 F Cross Sections - O

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5 kip/ft ( parabolic (2nd order) 3 C В -10 ft -10 ft The structure above is supported by a rocker at A and a pin at B. The structure is subjected to a parabolic (i.e. second order) distributed load, as shown. Assume that the rocker at A can resist a compressive or tensile normal force. Which of the following is closest to the vertical force reaction at the pin (i.e. By)? a) 50 kip b) 0 c) 22.5 kip O d) 33.3 kip