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    (Original post by TeeEm)
    When you can produce just 10% of what I produce we can have a conversation again ....
    good bye kid ...
    Probably quite a few years on you.

    But why produce so many help books with errors and also struggle with an A level mechanics problem.

    Get the basics down son before putting yourself forth as an expert.

    I'm done with dilettantes like you. Stick to GCSE.
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    (Original post by comoving_frame)
    Of course I can provide it. I'm a bloody astrophysicist not a plumber. You can solve this problem if you want as a central force orbital problem. Or you can do the basic mechanics that AQA would want you to do.

    But I am puzzled that someone with a Maths help website and years of experience is struggling.

    And as I said, now I know why there are errors in those books.
    Got some links to your papers?
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    I see we have a forum clique of the clueless.
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    (Original post by comoving_frame)
    Of course I can provide it. I'm a bloody astrophysicist not a plumber. You can solve this problem if you want as a central force orbital problem. Or you can do the basic mechanics that AQA would want you to do.

    But I am puzzled that someone with a Maths help website and years of experience is struggling.

    And as I said, now I know why there are errors in those books.
    whats his website?
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    (Original post by comoving_frame)
    Probably quite a few years on you.

    But why produce so many help books with errors and also struggle with an A level mechanics problem.

    Get the basics down son before putting yourself forth as an expert.

    I'm done with dilettantes like you. Stick to GCSE.
    Put a solution up or everyone is laughing at you silly boy ...
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    (Original post by Xenon17)
    whats his website?
    MadAsMaths I believe.
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    (Original post by comoving_frame)
    Of course I can provide it. I'm a bloody astrophysicist not a plumber. You can solve this problem if you want as a central force orbital problem. Or you can do the basic mechanics that AQA would want you to do.

    But I am puzzled that someone with a Maths help website and years of experience is struggling.

    And as I said, now I know why there are errors in those books.
    tbh a plumber probably earns more than you. and comes up with less ****.
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    Oh come on, guys. There's been far too much hostility in the maths forum today. Stick to the topic - avoid replying to trolls and/or insults.
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    (Original post by Zacken)
    Duplicate?
    Joined today, knows about TeeEm's booklets, very rude to TeeEm... clearly duplicate account of some troll
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    (Original post by TeeEm)
    Put a solution up or everyone is laughing at you silly boy ...
    You really can't solve it can you kid. Bloody hell I think you are the one courting embarrassment.

    I've given you enough hints.
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    (Original post by Zacken)
    Oh come on, guys. There's been far too much hostility in the maths forum today. Stick to the topic - avoid replying to trolls and/or insults.
    Why don't you kiddywinks solve this then. Do you even know what a central force is?

    Here's another hint for you lot:

    Binet's equation.
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    Yo TeeEm you had an answer yet?
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    (Original post by comoving_frame)
    Why don't you kiddywinks solve this then. Do you even know what a central force is?
    .
    I'm too dumb, sorry.

    Anyways - it's great that you can solve it, we'd all respect you a lot more if you could be courteous about it.
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    (Original post by comoving_frame)
    You really can't solve it can you kid. Bloody hell I think you are the one courting embarrassment.

    I've given you enough hints.
    the only astrophysics you can do is that involving your testicles ...
    either put a solution up, otherwise get out as your credibility is gone ....
    Simply you cannot do it ...
    I dare you !!
    If you manage it then you I belittled ....
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    ok nvm I don't understand the middle part of the question :/

    other than that it looked like fairly standard SHM stuff :dontknow:
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    (Original post by Alexion)
    Yo TeeEm you had an answer yet?
    I have written the answer before I even typed the question !!!
    I dare the kid to try !!
    Good bye kid ...
    Astrophysics my rear ....
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    (Original post by comoving_frame)
    Why don't you kiddywinks solve this then. Do you even know what a central force is?

    Here's another hint for you lot:

    Binet's equation.
    Binet's equation !!!!
    Put up a solution or get out !
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    (Original post by Zacken)
    Oh come on, guys. There's been far too much hostility in the maths forum today. Stick to the topic - avoid replying to trolls and/or insults.
    We just needed a bit of activity in F38...
    No hostility between us ...
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    Damn, mathematical **** talk, Newton vs Leibniz all over again...


    By the way TeeEm, could you possibly give us a way to report errors on your workbooks?(Great help though).
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    (Original post by TeeEm)
    I am disgusted today with this question ... I have spent then last 10 hours on it and I am about to pull my hair out as I do not even know what topics it involves ...
    Set up a rectangular coord system with the spring aligned along the x-axis at t=0. Let the particle have polar coords r, \theta. Then the Lagrangian of the system is:

    L=T-V = \frac{1}{2}m(\dot{r}^2 + r^2\dot{\theta}^2)-\frac{1}{2}\lamda(r-l)^2

    with associated Euler-Lagrange equations \frac{d}{dt}(\frac{\partial L}{\partial \dot{q}}) - \frac{\partial L}{\partial q} = 0 for each q \in \{ r,\theta \} giving:

    \frac{d}{dt}(m \dot{r}) -mr \dot{\theta}^2 + \lambda(r-l)=0 \Rightarrow m\ddot{r}= mr \dot{\theta}^2 +\lambda(l-r)
    \frac{d}{dt}(m r^2 \dot{\theta}) = 0 \Rightarrow m r^2 \dot{\theta} = C

    where the second eqn expresses conservation of AM.

    So we have:

    m\ddot{r}=C+\lambda(l-r) = K -\lambda r with K=C+\lambda l

    Now write \rho =\frac{\lambda r-K}{\lambda} to give m \ddot{\rho} = -\lambda \rho

    which is SHM in \rho. I got bored at this point, so I'll let someone else finish it off/correct my errors.
 
 
 
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