A friction-drive stainless steel metal belt runs over two 4-in metal pulleys ( f = 0.35). The belt thickness is to be 0.003 in. For a life exceeding 10^{6} belt passes with smooth torque \left(K_{s}=1\right), (a) select the belt if the torque is to be 30 lbf · in, and (b) find the initial tension F_{i} .