Problem statement

Solution video

**DISCUSSION THREAD**

* NOTE*: A typo has been corrected in the problem statement. Originally, the statement incorrectly referred to cable EC as cable AC.

Please post questions here on the homework, and take time to answer questions posted by others. You can learn both ways.

When looking at the force created by the weight W would we have to multiply by g (9.81) to find the force?

I had the same question. The problem mentions, "Assume the weight of the member to be negligible compared to the applied load." Does this imply that we can disregard gravity and simply multiply R_OA by W for the force?

The weight of the member refers to the AO rod, essentially simplifying the problem by reducing the gravitational forces to only that exerted by the weight at point D, which has a magnitude W.

It is also important to note that weight is a force, meaning that the force of gravity at D can be taken to be

simply W in the negative y, no multiplication necessary.

Found this super helpful video on a similar problem to help understand ball/socket connections and their reactionary forces.

https://www.youtube.com/watch?v=sEJmLnrnY28