(Solved): A two-tier system to repair bridges is supported by two steel cables for each platform (see the ...

A two-tier system to repair bridges is supported by two steel cables for each platform (see the figure below). Assume the applied loads are at the midpoint of each platform. (Assume that the elastic modulus for the steel cables is $30\mathrm{Mpsi}$.) Assume that two $150\mathrm{lb}$ workers are going to be standing on the system to repair a bridge, one on each platform. The following design requirement must be met. The stretch of each cable must be less than $0.01\mathrm{in}$. at the worst-case loading condition for each cable. Determine the minimum diameter (in inches) required for each cable. cable at $A$ in. cable at $B$ in. cable at $C$ in. cable at $D$ in.