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Need help with inclined ladders

Screenshot 2019-04-20 at 19.30.35.png

I don't understand why they took moments on some weird location..? this question is confusing
Reply 1
Avatar for mqb2766
mqb2766
21
Do you have the model solution handy, it would be easier to explain? Obviously they have to get a balance at both ends of the ladder.
Original post by Redslayed
Screenshot 2019-04-20 at 19.30.35.png

I don't understand why they took moments on some weird location..? this question is confusing
Original post by Redslayed
Screenshot 2019-04-20 at 19.30.35.png

I don't understand why they took moments on some weird location..? this question is confusing


Draw a diagram -

What do you call a 'weird location'? I would have thought one end of the ladder would be sensible.
They took moments from x, i don't know why.

And when i continue with the question, they take F x 2a x sin(x) as if it's going up, isn't it supposed to be
W x acos(x) + F x 2a x sin(x) = G x 2a x cos(x)
(edited 5 years ago)
Screenshot 2019-04-20 at 19.44.47.png180.9KB
Reply 4
Avatar for Notnek
Notnek
21
Original post by Redslayed
They took moments from x, i don't know why.

And when i continue with the question, they take F x 2a x sin(x) as if it's going up, isn't it supposed to be
W x acos(x) + F x 2a x sin(x) = G x 2a x cos(x)

You shouldn't be relying on the solution to do this question. Try it yourself, making a sensible choice to take moments and post your working here if you get stuck.

There's no real advantage to take moments about X so I'd ignore it.

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