For the truss structure with $P=100kN$ and $Q=80KN$ shown in the figure,

$($a$)$ list zero force members,

$($b$)$ determine reactive forces at H and J $,$ and

$($c$)$ determine member forces in $CJ,IJ,CD,$ and $DJ$ using the method of sections, and state whether they are in tension or compression.

Note: All numbers should be rounded to $2$ decimal places. If the method of sections was

NOT used, there will be a $30\%$ deduction.

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