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    Please can someone check my working; I've made a mistake somewhere
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    Anyone?
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    (Original post by pippabethan)
    Anyone?
    I seem to agree with your answer. What does your book say?

    Edit: wow... ignore this. As below, the centripetal acts towards the centre, i.e: in the same direction as tension.
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    (Original post by pippabethan)
    Please can someone check my working; I've made a mistake somewhere
    Why have you got mv^/r cos theta? You're resolving along the radius.
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    (Original post by ghostwalker)
    Why have you got mv^/r cos theta? You're resolving along the radius.
    I just did cos60 instead of sin30?
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    (Original post by pippabethan)
    I just did cos60 instead of sin30?
    There shouldn't be a sin or cosine term there at all. I think you've got confused The pendulum moves in a vertical circle, not a horizontal one.

    The centre of the circle is the point at the top from which the pendulum is suspended.

    mv^2/r is not acting horizontally.
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    Oh, okay, thank you
 
 
 
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