Figure S8.3shows a pin-jointed frame with a vertical load of 10 kips applied to node 1. A model is constructed to a linear scale factor of lp/ lm = kl = 10. In the model, member 47 is shortened by 0.5 in and the vertical displacement of node 1 is 0.43 in. Determine the force in the prototype in member 47 caused by the 10 kip load.