Recent content by philipc

I would like to add one more question, when a PV panel is rated for X watts, under what conditions can I assume it will achieve these numbers? Is there some standard whr/m2 that PV panels are rated?

Thanks that is exactly what I was looking for. To bad they left off the 4th largest city, Houston? But now I can use your key words. Thanks again Philip

I'm building a solar powered project to light a room. From what I find on the internet, the average of sun light is given. It seems like to make my calculations I need to know what the minimum amount of sunlight could be. I haven't been able to find a website that shows the min and max sun light...

Can you enlighten me on this custom menu stuff Philip

I know how to program the hot keys, but it displays only in the program window, if I can display it in the main window, I would be set. Any one know how to make a program display stuff in the main window? Thanks Philip

I have a class where I'm using the log function a lot, I would like to program a hot key to display log on my ti-89 for I don't have to mess with the catalog, any suggestions? Thanks Philip

Got one more let's say P(A|B) = .2 and I know P(B) to be .65, how can I solve for P(A)?

That gives the correct results thank, my problem I'm still having a hard time following the logic behind picking the numbers to work with. Here is another example from the book I can't find the logic If 3 of 20 tires are defective and 4 of them are picked randomly, what is the probability...

sorry your reply didn't help

I'm not having much luck learning from the examples in my probability book, they only do the most of basic examples, I'm in need of some good examples and solutions, any ideas? For example here is the problem I'm trying to work on A car rental agency has 18 compact cars and 12 mid-size cars...

Thanks guys for all yall's replies. I also asked another group and one guy gave me this link, http://www.whatsthebest-mattress.com/ Bunch of good reading here, now think I may go with latex instead. Got to love forums, opinions from the ones who is NOT selling the product. Philip

I just solved it, thanks I do have the locations of the points where the cables are attached, so I can make the angles. What I was doing was breaking each tension into 3 parts giving me 9 unknowns. I found a similar problems solved where they only used the three tensions as unknowns and used...

Doc, I was just wondering if there was a different approach that using 9 equations, some general laws I'm missing out on. To show the exact problem would be much harder than describing it, it's pretty simple, just imagine a mass hanging from three cables, and there three cables can be attached...

Memory Foam Mattress?? Commercials claim of the spectacular results seen by sleeping on a memory foam mattress, but I’ve yet to meet someone in person who actually owns one. By the advertisement, you would think everyone and his brother is now sleeping on one. Does anyone own one, and if so...

I'm a bit stuck on a tension problem, I have a weight supported by three cables. I will have to admit, up to this point, I have been cheating on these tension problems. What I have been doing is writing various equations and using my TI-89 to solve the system of equations. This method has been...