Question

Static equilibrium crane question attached in comments thanks...im aware of the processes used to answer this question: moments and sum of all forces in x and y directions....really need help with the answer as cant get it right

Answer 1

Perhaps you'd like to show some of your reasoning and workings here so you can be helped to see where the problems are....

Start by drawing a framework based on the drawing, and show the forces acting at each node.

Answer 2

This is quite tricky I think
My diagram makes a few assumptions - so feel free to ignore it

Note that HGI is a straight line

Also EK and KI are equal and can be derived from (a/sin30)

I think ABC & J are irrelevant to E (essentially a fixed foundation) so the free body diagram for E looks like:



Apart from the reaction forces at E only weight at H and tension at K act around E. SO take moments to solve for KJ tension

Then resolve KJ and solve reaction forces.

Assumptions are:
Mechanical structure is 'Light' (i.e. components have no mass)
ED can be considered as a beam (In truth some of the stress in CD would NOT pass through E)

That's my shot at it. Hope it helps