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    Doesn't look right, you should have a...

    Doesn't look right, you should have a subtraction between two expressions , one relating to the section of circle left to the vertical chord and one relating to the section right of the vertical...
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    You HAVE to, you are MISSING a force component...

    You HAVE to, you are MISSING a force component that operates in the opposite direction along the x axis. This is why you are getting the wrong result. I did this drawing for you to understand where...
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    OK with 1,2,3,4. Your error: The...

    OK with 1,2,3,4.


    Your error:
    The semicircle is divided by the vertical cord into TWO areas, you forgot to consider the contribution of the area between the vertical cord and the circle. This...
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    1. What is "n"? 2. Show step by step calculation...

    1. What is "n"?
    2. Show step by step calculation of the center of mass of the upper semicircle
    3. Did you double the force due to the lower semicircle contribution?
    4. Force looks like...
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    You are welcome.

    You are welcome.
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    Correct. Here is a second hint. Pick a point...

    Correct. Here is a second hint. Pick a point inside the disc, this is where you are calculating the force. Draw the diameter that passes through that point. Draw the cord perpendicular to the...
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    Hint: the net force in the center is zero. How...

    Hint: the net force in the center is zero. How about in an arbitrary point?
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    You can calculate it yourself if you know how to...

    You can calculate it yourself if you know how to do integration. Do you?
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