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Old Oct 26th 2017, 04:01 PM   #11
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The clasp at a distance of 0.6

C0.6
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Old Oct 26th 2017, 04:04 PM   #12
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Carpenters have a saying "Measure twice cut once"

What is the distance from the line of action of the clasp force C to PQ?

And are there any other forces acting that have moments about PQ?
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Old Oct 26th 2017, 04:28 PM   #13
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0.4m not 0.6m

I dont think there are any other.

In a 2 dimensional perspective theres 3 forces.

That acting on pq which has no moment, the moment around the hinge which is equal to 0.2xH and the moment around the clasp which is equal to 0.4xH?
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Old Oct 26th 2017, 04:41 PM   #14
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So now you have finally derived the equation I gave you at the beginning.

Well done



You have already calculated the thrust force so you have two equations in two unknowns (H and C) and you are only required to find one of them.
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Old Oct 26th 2017, 04:45 PM   #15
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Thanks very much for your help
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Old Oct 26th 2017, 04:49 PM   #16
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Unfortunately the teaching of moments is one of the worst areas in Mechanics, made worse by the difference between English and American terminology.
But it is very important so come back with more questions as you go along.

By the way, what is your course?
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Old Oct 27th 2017, 01:08 PM   #17
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The course is an NVQ Lvl 3 Electrical & Mechanical
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