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# M1 January 2007 Question 2 watch

1. I cannot do parts (b) onwards. I have read the mark scheme, and they say make C = 0. Why is that? Could someone explain to me how to do this step-by-step?
2. (Original post by blake11)

I cannot do parts (b) onwards. I have read the mark scheme, and they say make C = 0. Why is that? Could someone explain to me how to do this step-by-step?

Hello,

I'll give you a little hint;

when the rod is about to tilt at D; the reaction at C would be zero... think about it; if something is about the point of tilting the reaction at the other support must be zero !
3. (Original post by AdotK)
Hello,

I'll give you a little hint;

when the rod is about to tilt at D; the reaction at C would be zero... think about it; if something is about the point of tilting the reaction at the other support must be zero !
oh yeah.... ty man
4. (Original post by blake11)
oh yeah.... ty man
lol

so you get the right answer then?
5. (Original post by AdotK)
lol

so you get the right answer then?
yeah it's so easy once you know that

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