Multiple Choice Question: Xoc9dHk-1 How much work is done in winding-up the upper half of the chain?

How much work is done in winding-up the upper half of the chain?

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

A student in a chemistry laboratory wants to form a 32 milliliter mixture of two solutions to contain 30% acid.
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If 1200 cm^2 of material is available to make a box with a square base and open top, find the largest possible volume of the box.
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A stone is dropped into a well and the report of the stone striking the bottom is heard 7.7 seconds after it is dropped.
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