# Statics Help A Level Mathematics MechanicsWatch

#1
Hi, I'm doing this question to find out what tan theta is. I'm not sure what to do next after taking moments from A
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#2
Question 8. I'm posting my working out below
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#3
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4 weeks ago
#4
(Original post by Rolls_Reus_0wner)
Hi, I'm doing this question to find out what tan theta is. I'm not sure what to do next after taking moments from A
You don't seem to have posted your working showing you taking moments. Can you post that please?
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#5
(Original post by Notnek)
You don't seem to have posted your working showing you taking moments. Can you post that please?
Attachment 798694

I think i got it now. the solution bank took moments from X (will send a pic of that). how did i get the same answer?
Last edited by Rolls_Reus_0wner; 4 weeks ago
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4 weeks ago
#6
(Original post by Rolls_Reus_0wner)
First tidy that up by cancelling the 'a' on both sides. Now I look at what we're trying to get to and I see a so my next thought is to divide this equation by . Try that next.

Your aim after that will be to eliminate all the non- variables by using all of the equations that you've generated. Please post your full attempt if you get stuck.
Last edited by Notnek; 4 weeks ago
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4 weeks ago
#7
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#8
(Original post by Notnek)
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4 weeks ago
#9
(Original post by Rolls_Reus_0wner)
That's correct now.
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#10
(Original post by Notnek)
That's correct now.
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4 weeks ago
#11
(Original post by Rolls_Reus_0wner)
I'm guessing you're stuck from here? Looking at the final result, you'll clearly need to start introducing the 's by using the other equations.

looks like it will be useful...
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#12
(Original post by Notnek)
I'm guessing you're stuck from here? Looking at the final result, you'll clearly need to start introducing the 's by using the other equations.

looks like it will be useful...
final working: Took me an hour and half to figire this out...

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4 weeks ago
#13
(Original post by Rolls_Reus_0wner)
final working: Took me an hour and half to figire this out...
They're the best kind of questions - you learn so much

Im sure that your ability to tackle these long questions has improved just by doing this one. For these types of questions where they give the final result, always think about the best way to arrive at it, as I showed in posts above.
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#14
(Original post by Notnek)
They're the best kind of questions - you learn so much

Im sure that your ability to tackle these long questions has improved just by doing this one. For these types of questions where they give the final result, always think about the best way to arrive at it, as I showed in posts above.
One thing: how is ??? whts the proof for that?
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4 weeks ago
#15
(Original post by Rolls_Reus_0wner)
One thing: how is ??? whts the proof for that?
Sorry I shouldn't just have given you this equation. You wrote

and combining these gives

There are many different ways to go about the algebra in this question but the basic aim is to eliminate the non- variables in whichever way you choose.
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#16
(Original post by Notnek)
Sorry I shouldn't just have given you this equation. You wrote

and combining these gives

There are many different ways to go about the algebra in this question but the basic aim is to eliminate the non- variables in whichever way you choose.
Mind blown. thanks 4 all your help
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