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September 2nd, 2009, 02:57 PM   #1
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Geometry or weights?

Two parallel shelves, each exactly 138 cm long, have exactly 32 cm of space between them. A circular hoop is placed between the shelves. The hoop's cross-section is a 2.5 cm square. The hoop barely touches the top shelf, and rests on the corners of the bottom shelf, as shown . If the hoop's density is 7.85 grams per cubic centimetre, what is the hoop's total mass?
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September 2nd, 2009, 02:59 PM   #2
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Re: Geometry or weights?

i don't know if the image is showing or not but here is the link http://yfrog.com/6ccircleshelvesp
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September 2nd, 2009, 04:07 PM   #3
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Re: Geometry or weights?

Here's a start: sagitta properties.
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