Problem $4(30$ pts$)$: Trusses: determinacy &

method of Joints$/$Sections$.$ For the truss below:

$($i$)$ Calculate its determinacy $(3$ pts$)$

$($ii$)$ Generate the FBD $(3$ pts$)$

$($iii$)$ Solve for its reactions $(4$ pts$)$ and perform one

validation $(3$ pts$)$

$($iv$)$ Find the forces in the members EF$,$ HF$,$ EC$,$ AD

and $AB$ using the Method of Joints and$/$or Sections as

you best think fit. State if the members are in tension

or in compression as appropriately. $(17$ pts $)$

Note: do not forget to declare the

sign convention and reference line

you are using, along with all the

units for the quantities you derive.