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## High-voltage!

Imagine two high-voltage-masts/poles. (I don't know the proper english word for it). You know what Im talking about; the ones with cables to transport electricity. (Birds would sit on them and stuff.)

The two poles are both 25 meters in height and a cable of length 18 meters is suspended between the tops of the two poles.
When the cable is hanging, the lowest part of the cable is 16 meters above the ground.

Find the distance between the two poles. (i.e. How far are the two poles apart?)
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 Recognitions: Gold Member Science Advisor Staff Emeritus Well, perhaps I should not spoil it. This "brain teaser" has been around for a very long time, though, and has been posted here already numerous times. - Warren

## High-voltage!

 Quote by Healey01 Is it about 55m apart?
It cannt be - the cable is only 18m long.
 ha, totally wasnt paying attention and made a dumb mistake. Hold on. seperation ~ 4.256m? even thats looking wrong to me now... myabe i did the arc length wrong.
 djZblzrTdzbpZbpz
 Doesn't it sort of depend on the tension in the cable, the time of year and temperature, the age of the posts...? A bit difficult to say.

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 Quote by Adam Doesn't it sort of depend on the tension in the cable, the time of year and temperature, the age of the posts...?
Nope.
Oh, and the cable is extremely flexible.

 Quote by Tenaliraman djZblzrTdzbpZbpz`
Whazzat mean?
 Is this actually some type of brain teaser or an arc question?
 Recognitions: Gold Member Science Advisor Staff Emeritus Ha ha...I've never seen this one before, but all it takes is a diagram - a good, complete diagram. I was all prepared to find the arc length of a catenary...before I drew the picture. Should have known better, since this is posted as a brain teaser. The two poles are no distance apart.

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