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# Mecahnics question help watch

1. https://learning.watfordboys.herts.s...y_2009_PH1.pdf

Question 3 part 2 im generally allright on moments but all the ones ive done are just where objects are hanging down so its obvious what to do.
2. Nobody?
3. How have you attempted the question?
4. (Original post by jaroc)
How have you attempted the question?
I 'm not really ure how to start the format of the question has thrown me
5. (Original post by hazbaz)
I 'm not really ure how to start the format of the question has thrown me
Calculate the total clockwise moment about the hinge.
So, to start you off, can you determine the forces that act in the clockwise direction?
6. *mechanics
7. (Original post by jaroc)
All right. Are we talking about this? So, to start you off, can you determine the forces that act in the clockwise direction?
Yeah thats the question. Umm i had a look i though the hytoneuse of the triangle where the cable is would be but from looking at the markscheme it doesnt seem to be so im not really too sure
8. (Original post by hazbaz)
Yeah thats the question. Umm i had a look i though the hytoneuse of the triangle where the cable is would be but from looking at the markscheme it doesnt seem to be so im not really too sure
Well, tension in the cable acts in the anticlockwise direction, doesn't it?

Basically you have to determine forces that act clockwise - i.e. downwards in this case. Those would be weight of the rod and weight of the sign. What moments do these forces give?
9. (Original post by jaroc)
Well, tension in the cable acts in the anticlockwise direction, doesn't it?

Basically you have to determine forces that act clockwise - i.e. downwards in this case. Those would be weight of the rod and weight of the sign. What moments do these forces give?
I GET IT . It will be 19.6x1.8 +9.8x0.9 =44.1Nm
10. (Original post by hazbaz)
I GET IT . It will be 19.6x1.8 +9.8x0.9 =44.1Nm
Exactly

Can you proceed with (iii)?

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