Consider the portal frame shown in $($Figure $1).$ Assume all members of the truss to be pin connected at their ends. Suppose that P$1=19$ kN and P$2=38$ kN$.($a$)$ Determine $($approximately$)$ the force in the member CD of the truss and state if the member is in tension or compression. $($b$)$ Determine $($approximately$)$ the force in the member FJ of the truss and state if the member is in tension or compression. $($c$)$ Determine $($approximately$)$ the force in the member IJ of the truss and state if the member is in tension or compression. Express your answer in kilopounds to three significant figures. Enter negative value in the case of compression and positive value in the case of tension.