Question $2$: $($recommended time $-35$ minutes$)$

Determine the horizontal and vertical reactions at supports A and $B$ as well as the magnitude of

forces in members $DC$ and $EF.$ Indicate whether members $DC$ and $EF$ are in tension $(T)$ or

compression $($C$).$ Ignore the weight of all members.

a$)$ Is the structure shown above a truss, a frame, or a machine? Briefly justify your answer.

Answer:

b$)$ How many support reactions can be identified for the entire structure? Can you solve this

question according to the equilibrium of the entire structure? If your answer is "Yes", determine

the support reactions using the equilibrium equations of the entire structure and skip steps $($c$)$ to

$($e$).$ If your answer is $"$No$",$ move on to step $($c$).$

Answer: