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    I have an M2 exam tomorrow and was wondering if anyone could help me.

    in the questions involving ladders, you take moments about a point and you Do force x distance x sin/cosa

    How do you know whether to use sin or cos in this situation ?

    Thanks

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    I did A-level Maths several years ago, but I think it depends on whether you're resolving vertically or horizontally (or something like that!). I'm sure someone else will put you straight.

    If you're awake, you generally use cosa for the weight and sina for the reaction from the wall. This is because you're looking for the PERPENDICULAR distance of the line of action of the force to the point at which you're taking moments about.

    Best of luck, I've got M2 tomorrow (today) as well, and then 4 exams on Friday, and then two the following week. Help me LORD.
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    thanks for the help, good luck for you exams. what exams do u have on friday, i have synoptic physics which is bound to be hard!

    No problem.

    I have physics units 4 & 5 on Friday but not the Synoptic. I have that to enjoy next thursday. But I have an Economics synoptic instead.

    Good luck with yours as well.
 
 
 
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