Hey there! Sign in to join this conversationNew here? Join for free
    Offline

    12
    ReputationRep:
    (Original post by A Slice of Pi)
    I've just seen this, but I have an idea where to go with it...
    he is the chosen one, the azor ahai of mechanics
    • Thread Starter
    Offline

    18
    ReputationRep:
    (Original post by A Slice of Pi)
    I've just seen this, but I have an idea where to go with it...
    we are waiting for you, holding our breaths ...
    No pressure!
    Offline

    5
    ReputationRep:
    I'd love to have done m4/m5 but there are no textbooks for AQA...
    Offline

    8
    ReputationRep:
    Ok, I think I've done it but I need time to make a neat solution and photograph it etc should be up soon
    Offline

    8
    ReputationRep:
    I've just checked my answer and I cannot seem to get the cot term in there, I get tan, but it's very possible that I've made a silly mistake and I'll keep checking. I used cylindrical coordinates, if this is correct.
    • Thread Starter
    Offline

    18
    ReputationRep:
    (Original post by A Slice of Pi)
    I've just checked my answer and I cannot seem to get the cot term in there, I get tan, but it's very possible that I've made a silly mistake and I'll keep checking. I used cylindrical coordinates, if this is correct.
    somebody else also got tan
    Could I be wrong?
    Offline

    8
    ReputationRep:
    (Original post by TeeEm)
    somebody else also got tan
    Could I be wrong?
    I doubt you're wrong, but I'm quite rusty on the cylindrical stuff. I've been trying for a good 20 minutes to get a cot term in there but I can't see it.
    • Thread Starter
    Offline

    18
    ReputationRep:
    (Original post by A Slice of Pi)
    I doubt you're wrong, but I'm quite rusty on the cylindrical stuff. I've been trying for a good 20 minutes to get a cot term in there but I can't see it.
    yes, sorry it is a tan
    typo in my end
    Offline

    8
    ReputationRep:
    (Original post by TeeEm)
    yes, sorry it is a tan
    typo in my end
    So, just to confirm, what's the updated statement I have to show? Is it tan or -tan?
    • Thread Starter
    Offline

    18
    ReputationRep:
    (Original post by A Slice of Pi)
    So, just to confirm, what's the updated statement I have to show? Is it tan or -tan?
    tan it is
    Offline

    8
    ReputationRep:
    (Original post by TeeEm)
    tan it is
    In the final line, did you use sin^2 a + cos^2 a = 1? Because I get the two terms in brackets having the same sign, but this could easily be a silly mistake I've made with signs somethere
    • Thread Starter
    Offline

    18
    ReputationRep:
    (Original post by A Slice of Pi)
    In the final line, did you use sin^2 a + cos^2 a = 1? Because I get the two terms in brackets having the same sign, but this could easily be a silly mistake I've made with signs somethere
    +g tana - blah blah
    Offline

    8
    ReputationRep:
    (Original post by TeeEm)
    +g tana - blah blah
    Maybe it depends on the directions of the axes in my cylindrical system? But I have both mg and Nsina acting downwards, the "z" arrow pointing upwards, and the "r" vector and "Ncosa" going in the same direction...
    • Thread Starter
    Offline

    18
    ReputationRep:
    (Original post by A Slice of Pi)
    Maybe it depends on the directions of the axes in my cylindrical system? But I have both mg and Nsina acting downwards, the "z" arrow pointing upwards, and the "r" vector and "Ncosa" going in the same direction...
    No idea as this problem can be done in 3 different ways ...
    Offline

    8
    ReputationRep:
    (Original post by TeeEm)
    No idea as this problem can be done in 3 different ways ...
    It's getting a bit late now so I'll write up a solution tomorrow (probably after college now, as I'm not going to get much done during the day)
    • Thread Starter
    Offline

    18
    ReputationRep:
    (Original post by A Slice of Pi)
    It's getting a bit late now so I'll write up a solution tomorrow (probably after college now, as I'm not going to get much done during the day)
    no worries
    your reputation is at stake !
    Offline

    2
    ReputationRep:
    (Original post by drandy76)
    Yet they don't even have the decency to make FP4


    Posted from TSR Mobile
    (Original post by morgan8002)
    FP5, you mean?
    FP3 is already ****ing disgusting. **** an FP4.

    i bet a D3 would be horrendous too
    Offline

    12
    ReputationRep:
    (Original post by Lawliettt)
    FP3 is already ****ing disgusting. **** an FP4.

    i bet a D3 would be horrendous too
    But where else would OCR introduce vectors in higher dimensions and further integration? D3 would probably have like 3 people sitting per year
    Offline

    2
    ReputationRep:
    (Original post by drandy76)
    But where else would OCR introduce vectors in higher dimensions and further integration? D3 would probably have like 3 people sitting per year
    Implying they wouldn't give us 4D shapes
    Online

    17
    ReputationRep:
    (Original post by Lawliettt)
    FP3 is already ****ing disgusting. **** an FP4.

    i bet a D3 would be horrendous too
    D3+ would start to get interesting actually
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Brussels sprouts
    Useful resources

    Make your revision easier

    Maths

    Maths Forum posting guidelines

    Not sure where to post? Read the updated guidelines here

    Equations

    How to use LaTex

    Writing equations the easy way

    Student revising

    Study habits of A* students

    Top tips from students who have already aced their exams

    Study Planner

    Create your own Study Planner

    Never miss a deadline again

    Polling station sign

    Thinking about a maths degree?

    Chat with other maths applicants

    Can you help? Study help unanswered threads

    Groups associated with this forum:

    View associated groups
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.