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Conservation of Energy & D'Alembert's Principle Problem watch

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    I'm doing some question papers as revision and i've got a question that i'm not confident with my answer.

    The question is :


    My work using Conservation of Energy:


    and my work for D'Alembert's is:


    I was expecting to get similar results for Work Done, Torque and Power But they are completely different.

    I'm guessing there is an error in my working somewhere, but i have been over it a number of times and keep getting the same numbers so i'm missing something. Could anyone offer some insight?

    Thanks in advance
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    (Original post by SteveMcs)
    I'm doing some question papers as revision and i've got a question that i'm not confident with my answer.

    I'm guessing there is an error in my working somewhere, but i have been over it a number of times and keep getting the same numbers so i'm missing something. Could anyone offer some insight?

    Thanks in advance
    Not an expert at this level - never come across D'Alembert's principle.

    Regarding conservation of energy.

    I'd have thought you needed work done against linear force = 150x5=750 Nm (which in itself is greater than the 583.33 you have for friction).

    Work done against bearings = 5 x "angle through which drum turns = 5 x (5/(0.6pi)*(2pi))

    Workdone in accelerating the drum =....
 
 
 
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