I don’t know how to handle this Science question and need guidance.

Truss ABC is changed by decreasing its height from H to 0.9 H. Width W and load P are kept the same. Which one of the following statements is true for the revised truss as compared to the original truss, explain in detail?

A) Force in all its members have decreased.
B) Force in all its members have increased.
C) Force in all its members have remained the same.
D) None of the above.

can you help me with this question, I have the final answer which  is 63.1, but I need the steps.

when F is  170 N, and G is 320 N, α = 28, β = 18, and r = 330 mm, 

Find the reqired angle(theta ) so the resultant couple moment =0. 

can you help me with this question, I have the final answer which  is 63.1, but I need the steps.

when F is  170 N, and G is 320 N, α = 28, β = 18, and r = 330 mm, 

Find the reqired angle(theta ) so the resultant couple moment =0.