11.103 Members of the truss shown consist of sections of aluminum pipes with the cross-sectional areas indicated. Using E = 70 GPa, deter- mine the vertical deflection of joint D. Members AB, AC, AD, and CE: A = 500 mm²; other members: A = 1000 mm². 40 kN E 1.5 m D 0.6 m B | Ao -0.8 m- -0.8 m→ Fig. P11.103

The length of BC and CD are the same, calculate the force in each member of the struss.

The truss ABC is constructed of three titanium (E Ti ​ =17.4×10 3 ksi) members. A horizontal force of 1.8 kip and an unknown force P are applied to the truss at point B as shown. Member AB has a cross-sectional area of 0.1in 2 , member BC has a cross-sectional area of 0.0025ft 2 , and member AC has a cross-sectional area of 0.2 in2.   b) Determine the magnitude of the force P that is required to displace the roller at point C to the right by .03 inches.