please help me with a b and c$...$ The rigid member is held in the position shown in $($Figure $1)$ by three A$-36$ steel tie rods.

Each rod has a diameter of $20$ mm $.$ The lead of the screw is $0\mathrm{.}84$ mm $.$ Neglect the size of

the turnbuckle and assume that it is rigid. Note: The lead would cause the rod, when

unloaded, to shorten $0\mathrm{.}84$ mm when the turnbuckle is rotated one revolution.

Figure

Determine the force in the rod $AB$ if a turnbuckle on rods $AB$ and $CD$ undergoes one and a half revolution.

Express your answer to three significant figures and include the appropriate units.

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Part B

Determine the force in the rod $CD$ if a turnbuckle on rods $AB$ and $CD$ undergoes one and a half revolution.

Express your answer to three significant figures and include the appropriate units.

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Part C

Determine the force in the rod $EF$ if a turnbuckle on rods $AB$ and $CD$ undergoes one and a half revolution.

Express your answer to three significant figures and include the appropriate units.