Q3. A rigid beam AB, the deformation of which may be neglected, is suspended horizontally from rods 1 and 2, each of which has a circular cross-section. Rod 1 is of steel, and has a diameter of 20 mm, while rod 2 is of copper, and has a diameter of 25 mm. At what distance from the joint A (see figure) must the load P be applied, if the beam AB is to remain horizonatal after the deformation of the rods? What stresses will then occur in the rods, if P = 3t? Answer: a-1-08 m; σ(1) = 440 kg/cm2; σ(2) = 330 kg/cm2. 15m a A -2m 2- Im

В A B C The system above is comprised of two-force members AB and AC, supporting a vertical force at point A. Assuming the system is drawn to scale and is in equilibrium, which of the following best describes the nature of the forces in members AB and AC? a) AB is in tension AC is in compression b) AB is in compression AC is in compression c) AB is in tension AC is in tension d) AB is in compression AC is in tension

help find the stress at segment BC, please

3. The center post B of the assembly has an original length of 124.8 mm whereas posts A and C have a length of 125 mm. If the caps on the top and bottom can be considered rigid, determine the average normal stress in each post. The posts are made of aluminum and have a cross sectional area of 400 mm². Ea=70 GPa. Use the Force Method 100 mm -100 mm 800 kN/m 125 mm 800 kN/m