Question: The telescoping arm ABC is used to provide an elevated platform for construction workers. The workers and the platform together have a mass of 200 kg and have a combined center of gravity located directly above C. For the position when θ= 20°. determine (a) the force exerted at B by the single hydraulic cylinder BD.(b) the force exerted on the supporting carriage at A.
Answer:
Step 1 of 7
Given
The total mass of the workers and platform 
Angle 
Step 2 of 7
Free body diagram of the boom
Step 3 of 7
From the geometry of figure
Step 4 of 7
Taking moment about the point A
Step 5 of 7
Taking the condition of equilibrium,
Step 6 of 7
Taking the condition of equilibrium,
Step 7 of 7
The resultant acting at the point A is determined by using
