The pin-connected assembly consists of aluminum rods (1) and (2) and steel rod (3). The aluminum rods each have a diamet

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The pin-connected assembly consists of aluminum rods (1) and (2)
and steel rod (3). The aluminum rods each have a diameter
of 13 mm and an elastic modulus
of E = 74 GPa. The steel rod has a
diameter of 17 mm and an elastic modulus
of E = 180 GPa.
Assume a = 3.5 m, b = 1.3 m,
and c = 1.4 m. What is the magnitude
of load P that is necessary to displace
point A 5 mm to the left?