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Constant speed circular motion, starting with x = (cos,sin) and deriving the speed and radial centripetal force
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Make sure you did the first part of this question where w=sqrt(g/l)
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Make sure you sketch/write down the forces for this question
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Be clear about how the small angle parts are used for shm
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Think about working back from the answer here so cos(2...) = ... and use that to guide your working.