$3.$ The maximum allowable tensile force in the members of the truss is $($Fi$)$ max $=1,500$ lb$,$ and the maximum allowable compressive force is $($Fc$)$max $=800$ lb$.$ Determine the maximum magnitude P of the two loads that can be applied to the truss. Take a $=8$ ft$.$

B

P

a

$34$

A

P

$1-14$

a

C

$000$