Science & Mathematics - 31 October 2006

2006-10-31 16:47:55 · 8 answers · asked by johnid 1 in Earth Sciences & Geology

I have a graduate degree in electrical engineering with a specialty in electromagnetics. Yet none of my textbooks can give a decent mathematical description of baluns, ununs, feedline chokes, or similar devices. I have seen plenty of "hand-waving" explanations that give a general idea about these things, but I have yet to see anyone "do the math." Does anyone know of a good website or a good textbook that mathematically models these devices? It is almost as if the balun is a magical "black art" that no one can fully characterize.

Thanks!

2006-10-31 16:44:54 · 1 answers · asked by Anonymous in Engineering

2006-10-31 16:42:27 · 16 answers · asked by Victoria Z 1 in Zoology

the problem is:

find v=d/t and its uncertainty if d=5.10 +/- 0.01 and t=6.02 +/- 0.02

I know v is 0.847 but I can't figure out how to find the uncertainty.

there is a similar problem too:

Find P=IV if I=2.10 +/- 0.02 and V=1.02 +/- 0.01

Please help. I just need to know where to start with these problems...

2006-10-31 16:40:16 · 5 answers · asked by Anonymous in Physics

2006-10-31 16:39:24 · 4 answers · asked by Anonymous in Mathematics

What do you think of it? Suppose there is, then how does it look like? Only serious answer please.

2006-10-31 16:36:56 · 8 answers · asked by creamy 1 in Astronomy & Space

2006-10-31 16:36:10 · 3 answers · asked by moaiedr 1 in Engineering

2006-10-31 16:34:42 · 7 answers · asked by swapnil s 1 in Mathematics

1. A right conical vessel with base radius 2m and height 4m is being filled with water at a constant rate of 3m^3/min. At what rate is the water rising when the depth is 3m?

Please show full working as I have an exam in 2 days and need to get rid of all my mistakes. Thanks

2006-10-31 16:32:17 · 2 answers · asked by Anonymous in Mathematics

I take 50 mg daily right now for depression and anxiety, but are thinking of stepping it up to 100 mg.

2006-10-31 16:27:37 · 8 answers · asked by boohamjad 1 in Medicine

A car weighing 8600 N moves along a level highway witha speed of 83 km/h. The power of the engine at this speed is 67kW. The car encounters a hill inclined at an angle of 5.9 degrees with respect to the horizontal. If there is no change in the power of the engine, and no change in the resistive forces acting on the car, what is the new speed of the car on the hill? Answer in units of km/h, and show steps because i want to know how to do this for future use.

2006-10-31 16:25:57 · 1 answers · asked by scherdaddy 1 in Physics

2006-10-31 16:24:33 · 2 answers · asked by rakesh k 1 in Engineering

2006-10-31 16:24:28 · 9 answers · asked by Anonymous in Medicine

2006-10-31 16:23:42 · 6 answers · asked by gustavoperezassociates 1 in Mathematics

I want to build simple robot with AVR mega8, where can i find sample programs in assembly languague ?

2006-10-31 16:22:54 · 1 answers · asked by Anonymous in Engineering

2006-10-31 16:19:30 · 18 answers · asked by destany d 1 in Mathematics

2006-10-31 16:18:34 · 5 answers · asked by shelly 2 in Other - Science

2006-10-31 16:16:57 · 20 answers · asked by RydrCup99 1 in Mathematics

2006-10-31 16:11:16 · 11 answers · asked by Gayatri 2 in Physics

I am building a subdivision and the minimume size pond must be half acre.I want my entry road to go through the middleof the pond with a huge 10 foot colvert pipe style bridge.The problem is that a person says i have to ponds under half acre.I say i have one pond covered with a bridge.how do i prove that ??Plus is that still one ecosystem??

2006-10-31 16:08:42 · 2 answers · asked by Irene D 1 in Engineering

1)Suppose a metal sphere is launched up a ramp [incline of 20 degrees] with Vi = 1.5 m/s. The end of the ramp is 1.20 m
above the floor. Calculate the range of the sphere.
2)Now suppose that the ramp is tilted downwards as shown below. Suppose that the sphere leaves the ramp at 1.5 m/s. The bottom of the ramp is 0.90 m above the floor. Calculate the range of the sphere.
1) the ramp rises up and the ball moves up
2) the ramp goes down and the ball moves downwards.

2006-10-31 16:03:55 · 4 answers · asked by Neo 2 in Physics

i can't find my answer in the book or notes. and i need help, fast.

2006-10-31 16:00:46 · 10 answers · asked by lhoffm08 1 in Chemistry

Reality to me means somthing that I can see, touch, talk about, know to be there or have been there and information from reliable sources ect. BUT! what about existance, what about space, what about infinity and the boundries of the universe. Are we real or only real in our minds. Will we evolve into another species with minds that are able to actualy understand our position in the cosmos

2006-10-31 15:59:52 · 11 answers · asked by Redmonk 6 in Astronomy & Space

2006-10-31 15:58:32 · 5 answers · asked by Anonymous in Mathematics

http://i1.ebayimg.com/01/i/08/d3/da/20_1_b.JPG

i have heard some gel wax thing or something made of dense oil or whatever. but i hav a science thingy that i need help. anyone know what it is called? or hav a link or something?

2006-10-31 15:58:18 · 4 answers · asked by science project due on 17th 1 in Other - Science

2006-10-31 15:57:56 · 7 answers · asked by SERGEY K 1 in Engineering

2006-10-31 15:57:05 · 8 answers · asked by emmyfair 3 in Zoology

please help i need it badly....i need to understand this T_T

1. z=y^2/25-x^2,this surface is hyperbolic surface,what is the opening of this equation(i need the pening to determine the parallel) and the traces and the parallel to these..

2. x^2+y^2-z^2= 16,what is the opening and the traces...i'm not sure if the equation is a ellipsoid.....


please help me ......many thanks

2006-10-31 15:54:30 · 2 answers · asked by jhen_hidaka 1 in Mathematics

2006-10-31 15:53:32 · 15 answers · asked by Butterfly Princess 4 in Weather

2006-10-31 15:53:13 · 9 answers · asked by MARY B 1 in Earth Sciences & Geology