Maths Quiz

Submitted: Sunday, Nov 05, 2006 at 21:13
ThreadID: 39181 Views:2788 Replies:8 FollowUps:7
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Ok boys & girls, it is time to see who remembers their high school maths.
I have a solar panel that is 525mm in width, I wish to mount it at a 40deg angle from the horizontal. What height will the top of the panel be?

Think of a right angle triangle, the hypotenuse is 525mm, A is the height of the triangle, B is the length of the triangle. The 3 angles of the triangle are 90deg, 40 deg & 50deg.

First correct answer (A=?) wins the prize, note "make adjustable legs is incorrect".

from Marty.
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Reply By: Member - Andrew (QLD) - Sunday, Nov 05, 2006 at 21:24

Sunday, Nov 05, 2006 at 21:24
A=337.5mm.......IIRC sin40 x 525mm

Though, with the width measurements you may not be able to work out the answer as the height is more commonly used as its "orientation"....

Andrew
AnswerID: 203249

Follow Up By: MartyB - Sunday, Nov 05, 2006 at 21:33

Sunday, Nov 05, 2006 at 21:33
Thanks Andrew,
Now I can make my solar panel brackets (I didn't knoiw how to work it out myself).

from Marty.
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FollowupID: 462836

Reply By: Member - Phantom (WA) - Sunday, Nov 05, 2006 at 21:32

Sunday, Nov 05, 2006 at 21:32
I agree, 337.5 however width is not relevant!
AnswerID: 203250

Reply By: Member - Cruiser (NSW) - Sunday, Nov 05, 2006 at 21:37

Sunday, Nov 05, 2006 at 21:37
Bloody hell, I knew all those Algorithms and Logarithms that I did 50 years ago would come in handy 1 day.

All I need to do now is get a solar panel.
AnswerID: 203253

Reply By: MartyB - Sunday, Nov 05, 2006 at 21:44

Sunday, Nov 05, 2006 at 21:44
Thanks for the replies, Now all I need to do now is get around to making my 337.5 mm legs.

Marty.
AnswerID: 203255

Follow Up By: Member - Andrew (QLD) - Sunday, Nov 05, 2006 at 21:58

Sunday, Nov 05, 2006 at 21:58
since your still here and not out there making those fine tolerance legs, a simple question for you:

why 40 degrees?

My understanding is that the tilt angle is normally around your equivalent latitude for best year-round average performance......though people seem to add 10 to 12 degrees to this to allow for a winter bias. AFAIK 5-10 degrees either way isn't going to kill anyone.

Enjoy

Andrew

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FollowupID: 462843

Follow Up By: MartyB - Sunday, Nov 05, 2006 at 22:15

Sunday, Nov 05, 2006 at 22:15
Hi Andrew,
Where I live is a about lat 26. 26 deg would look too much like a jump ramp to my kids on pushies. I am worried about them being run into, walked into or what ever other fate they are likely to suffer. 40 deg I though would be a reasonable compromise to being visable and still working ok. Previously I mounted them flat on a pole mounted to my A frame. The pole is a pain to carry so I thought I would try them on the ground.
Years ago I was installing panels around the Rockhampton area for Telecom. These were mounted at 39 deg, we were told the extra angle was to make them self cleaning (wash the bird poop off).

from Marty.
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Follow Up By: Member - Andrew (QLD) - Sunday, Nov 05, 2006 at 22:49

Sunday, Nov 05, 2006 at 22:49
LOL thanks for the info.....

Andrew
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Reply By: Jimbo - Sunday, Nov 05, 2006 at 22:07

Sunday, Nov 05, 2006 at 22:07
SOHCAHTOA
AnswerID: 203258

Follow Up By: Member - Andrew (QLD) - Sunday, Nov 05, 2006 at 22:14

Sunday, Nov 05, 2006 at 22:14
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Reply By: Member - Jack - Sunday, Nov 05, 2006 at 23:25

Sunday, Nov 05, 2006 at 23:25
Does it have something to do with the old Indian theorem that "the squaws on the hippotamus hide is equal to the sons of the squaws on the other two hides"???

Been a long time.

Jack
The hurrieder I go, the behinder I get. (Lewis Carroll-Alice In Wonderland)

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AnswerID: 203270

Follow Up By: Mr Fawlty - Monday, Nov 06, 2006 at 16:36

Monday, Nov 06, 2006 at 16:36
Mabe Jack you are onto something.... I heard about some poor indian on a reservation drunk 60 cups of tea - he was found drowned in his own tee - pee.....
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Reply By: Member No 1- Monday, Nov 06, 2006 at 08:07

Monday, Nov 06, 2006 at 08:07
it depends on how off the ground it will be to start with
AnswerID: 203290

Reply By: Des Lexic - Monday, Nov 06, 2006 at 10:01

Monday, Nov 06, 2006 at 10:01
But What If the ground isn't level
Answer is 14 1/4 inches Send me my prize
AnswerID: 203304

Follow Up By: Member - Andrew (QLD) - Monday, Nov 06, 2006 at 10:50

Monday, Nov 06, 2006 at 10:50
Answer must be in the format A=?, sorry to say ;-)

A=0mm when placed on a 40 degree slope.....problem solved cheaply :-)

Andrew
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