HW Monday, 1-13

D & F periods
Solve for the member forces on the truss below (the same one we did in class)

• isolate one joint at a time.
• draw an FBD for that joint
• Use trig to break member forces into x and y components
• ADx = ADcos()
• ADy = ADsin()
• set up equilibrium equations to solve for member forces
• Repeat until you solve for all member forces (hint: start at joints that have the least number of forces)

Knowns

• Ray = 66 2/3 lb;  Rby = 33 1/3 lb;  Rax = 0
• Fdy = -100 lb
• AC = 3', BC = 6', CD = 4'

How do I do this again? - http://youtu.be/cOSv5V9ShOs