GCFC
Davide Santon
+45|6316|NY/CT
If anyone can help me out with this I'll love you =]

The ceiling supports in a new discount department store are 4m apart.  Lights are to be hung from
these supports by chains in the shape of a “Y.”  Each light uses only one chain. If the light is 3m
below the ceiling,
a) What is the shortest length of chain that can be used to support one of these lights?
b)  Assume the cost of chain is $5.00/m.  What is the minimum cost for the chain for 10 lights?

https://img695.imageshack.us/img695/9831/calca.jpg
Macbeth
Banned
+2,444|5973


First thing to pop into my mind.
gurdeep
­
+812|5142|proll­y
350?
NeXuS
Shock it till ya know it
+375|6729|Atlanta, Georgia
9
HaiBai
Your thoughts, insights, and musings on this matter intrigue me
+304|5871|Bolingbrook, Illinois
a. 3.61 meters
b. $14.42

i just assumed "shortest length" means that they're equal

lol nvm didn't read it correctly

Last edited by HaiBai (2011-11-16 19:50:10)

GCFC
Davide Santon
+45|6316|NY/CT
so no one here knows? yea right
Jay
Bork! Bork! Bork!
+2,006|5745|London, England
The diagram sucks but what you want are two 45 degree angles. Using law of sines, this gives you arm lengths of 2rad2 meters per. The y length for that triangle is 2m, add one meter for the light to hang to 3ft and you end up with 4rad2+1 chain per setup. ~6.65m * $5 *10 = $332.84

Last edited by Jay (2011-11-16 20:12:18)

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