Problem $2$: For the bridge truss given below:

a$)$ Draw and label the influence line for the force in member J$-$K$.$

b$)$ Determine the maximum force in member J$-$K due to a moving point load of $6$ k $.$

c$)$ Determine the load in member J$-$K for a distributed load of $500l\frac{b}{f}t$ along the entire length of the truss.