Need formula to solve a word problem

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Need formula to solve a word problem

Postby Jomath on Wed Feb 15, 2012 11:01 pm

The word problem is - Suppose you have a pipe with a circumference of 8cm and length of 30cm, and that 10 turns of a wire are wrapped around the pipe. What is the length of the wire? (write the answer to two decimal points). I can picture what is going on in the word problem and draw it out, but I still have no clue what formula is needed to salve the problem, please help...thx
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Re: Need formula to solve a word problem

Postby little_dragon on Wed Feb 15, 2012 11:44 pm

Jomath wrote:Suppose you have a pipe with a circumference of 8cm and length of 30cm, and that 10 turns of a wire are wrapped around the pipe. What is the length of the wire?

theres complicated formulas for if U use width of the wire
they didnt give you that so i dont think U have to do that
i dont no why they said length
just do 10*circumference i think
i dont no why they said stuff abt dec places
maybe theres some formula they want U to use??
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Re: Need formula to solve a word problem

Postby jpcode on Fri Mar 23, 2012 7:53 pm

I think you must wrap the wire so that it starts at one end and ends at the other. So unwrap the cylinder so that is is a rectangle 8x30 cm. The wrapped wire crosses this rectangle 10 times so every 3 inches forming 10 right triangles with legs 8 and 3. So the wire is the sqrt of 73 and you have 10 of them so 10sqrt73 so 85.44
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