Part B $-$ Tutorial: Method of joints

The truss shown in is subjected to a force $P=280$ and has dimensions $L1=1\mathrm{.}3$ and $L2=3\mathrm{.}6m.$

Plan to solve the Tutorial:

Since all of the joints have more than two unknowns, begin by finding a support reaction. What is the vertical reaction at $C{C}_y$ Note that $C_x=0?$ Then find the

reaction at A $A_x$ and $A_y.$

Now joint $C$ has two unknowns. Use the equilibrium of joint $C$ to calculate the force in $CD.$ Use a negative sign to indicate compression.

Use the equilibrium of joint $C$ to calculate the force in $BC.$ Use a negative sign to indicate compression.

Use the equilibrium of joint $B$ to calculate the force in $BD.$ Use a negative sign to indicate compression.

Use the equilibrium of joint $B$ to calculate the force in $AB.$ Use a negative sign to indicate compression.

Use the equilibrium of joint $D$ to calculate the force in $AD.$ Use a negative sign to indicate compression.

Separate your answers with commas

$C_y,A_x,A_y,F_{CD},F_{BC},F_{BD},F_{AB},F_{AD}=355\mathrm{.}28,-280,355\mathrm{.}38,438\mathrm{.}38,256\mathrm{.}68,0,280,355\mathrm{.}38ib$