On Tue, 03 Mar 2009 10:36:34 +0000, Tim Jackson

*>Curbie wrote:*

*>> I'm drawn to your use of the word "canceling", I've been using the*

*>> word "countering" in my notes and I know they're two different words*

*>> with essentially the same meaning with no real significants to these*

*>> problems, but any excuse to rewrite my notes will force a much needed*

*>> review at this point.*

*>> *

*>> I'm still muddy on when to apply which ratio of sine, cosine, or*

*>> tangent to solve for a particular force, I not looking for help with*

*>> this just "thinking out loud", this answer seems to be the key to*

*>> solving these problems and feel I will only properly understand its*

*>> application through study and review.*

*>> *

*>> Thank you the efforts of this example, it should be obvious from this*

*>> post that I still don't get it, but thanks to the efforts a you and*

*>> others, feel like I am sneaking up on it.*

*>> *

*>> Curbie*

*>> On Mon, 02 Mar 2009 19:02:45 -0600, david.williams@bayman.org (David*

*>> Williams) wrote:*

*>> *

*>> *

*>> *

*>The mnemonic I learnt for right triangles was*

*>"Old Horses All Have Old Aunties": O/H A/H O/A*

*>Sine = Opposite/Hypotenuse*

*>Cosine = Adjacent/Hypotenuse*

*>Tangent = Opposite/Adjacent*

The mnemonic I've been using is:

Some Old Hippy Caught Another Hippy Tripping On Acid

(mnemonic for remembering ratios of sine, cosine and tangent)

Sinb = Opposite / Hypotenuse Cosb = Adjacent / Hypotenuse Tanb =

Opposite / Adjacent

I relate to it better, and therefor the mnemonic easier to remeber.

*>Where Opposite and Adjacent refer to the side's relationship to the *

*>angle in question.*

When putting together my cheesy little spreadsheet to study angles I

ported some Internet Java script equations for the calculations of the

beta angle from ratio of sinb, cosb, or tanb. I think the porting

(which is second nature for me) was faster in reaching the

destination, but I missed something in sort cutting the journey. my

mind just focuses on things it doesn't understand and dumps everything

else on the subject until the details are tidied up. I just have to go

after it again.

*>Silly, but I don't forget.*

*>When calculating loading forces for engineering purposes don't forget *

*>that static forces are only half the story, for example the static *

*>lateral force on the base is nominally zero, but if it were unrestrained *

*>the tower wouldn't stand up for long. Winds can produce unequal drag *

*>above and below the guys (wherever you put them) and can set up bending *

*>and oscillations which will confound your static calculations. And *

*>maybe you need to allow for a maintenance man climbing the tower.*

*>That's why engineers tend to use large safety margins.*

*>Tim Jackson*

Thanks.

Curbie

On Mar 3, 10:38am, david.willi...@bayman.org (David Williams) wrote:

*> Around here, kids are taught the "word" SOHCAHTOA.*

That's what I learned, as a fake Native American name.

Memorize the square roots of 2 and 3 and how they apply to 45 and

30/60 degree right triangles. You can design a lot of stuff with only

those angles. They are useful in electrical engineering too.

Jim Wilkins

KB1DAL

>Curbie wrote:>> I'm drawn to your use of the word "canceling", I've been using the>> word "countering" in my notes and I know they're two different words>> with essentially the same meaning with no real significants to these>> problems, but any excuse to rewrite my notes will force a much needed>> review at this point.>>>> I'm still muddy on when to apply which ratio of sine, cosine, or>> tangent to solve for a particular force, I not looking for help with>> this just "thinking out loud", this answer seems to be the key to>> solving these problems and feel I will only properly understand its>> application through study and review.>>>> Thank you the efforts of this example, it should be obvious from this>> post that I still don't get it, but thanks to the efforts a you and>> others, feel like I am sneaking up on it.>>>> Curbie>> On Mon, 02 Mar 2009 19:02:45 -0600, david.williams@bayman.org (David>> Williams) wrote:>>>>>>>The mnemonic I learnt for right triangles was>"Old Horses All Have Old Aunties": O/H A/H O/A>Sine = Opposite/Hypotenuse>Cosine = Adjacent/Hypotenuse>Tangent = Opposite/Adjacent