Multiple Choice Question: Xoc9dHk-2 How much work is done in winding-up the full length of the chain?

How much work is done in winding-up the full length of the chain?

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Orphaned Multiple Choice Questions (MCQ) due to changes of exam system.

A circle of radius 1 unit is shown. AD is the diameter of the circle and O is the center. Find the length of arc BC.  
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Xoc9dHk-1 How much work is done in winding-up the upper half of the chain?
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