Science & Mathematics - 27 November 2007

it has 10 letters the 2nd to the last letter is N

2007-11-27 09:49:39 · 2 answers · asked by downwithdew 1 in Weather

i just saw that on t.v. but i think i heard wrong... can somebody please tell me

2007-11-27 09:49:29 · 4 answers · asked by AC/DC 2 in Zoology

I was using a airfoil in a wind tunnel in school to find out drag and Co-efficient of drag.. anyway. Drag was given from the computer and i need to calculate the coefficient. I found that i need the surface area. I have the dimensions of the wing im using. They are 19.5cm x 10.3. So do i just multiply those, or do i also multiply by 2 to account for the top and bottom. Or is the surface area when calculating Cd just one side. thanks

2007-11-27 09:48:24 · 2 answers · asked by joe 1 in Engineering

Estimate definite intergral of ∫√x dx, a = 0, b = 1, using lower sum with 4 partitions.

Not sure how to approach this problem...

2007-11-27 09:41:56 · 1 answers · asked by Anonymous in Mathematics

What is the wavelength of a photon needed to excite an electron from (-15 x 10^-19) to (-1.0 x 10^-19)?
I know the first step is to do (-1.0 x 10^-19) - (-15 x 10^-19)
which equals (1.4 x 10^-18).

2007-11-27 09:41:36 · 2 answers · asked by RK 2 in Physics

Divers in Acapulco dive from a cliff that is 61 m high. If the rocks below extend outward for 23m what is the minimum horizontal velocity a diver must have to clear the rocks??

do you break into compents?? like
23cos(90)=0
23sin(90)=23
plz help my teacher is horrible!!

2007-11-27 09:38:07 · 3 answers · asked by softballviolinist14 3 in Physics

Just wondering. Some say 500 (Farenheit, I kno i spelt that wrong...) other say 1,000. Anyone have definent answers?

2007-11-27 09:37:37 · 5 answers · asked by Anonymous in Engineering

I know not all fish eat plankton...but of the fish that do, how much do they eat a day?

2007-11-27 09:35:59 · 1 answers · asked by dobmeier c 3 in Zoology

when and where can i see mercury, venus, mars, and jupiter with an unaided eye?

thanks.

2007-11-27 09:32:46 · 4 answers · asked by Lo. 3 in Astronomy & Space

Math question.

2007-11-27 09:32:02 · 7 answers · asked by Anonymous in Mathematics

a.precipitation
b.evaporation
c.photosynthesis
decomposition

i dont know what the answer is

2007-11-27 09:31:24 · 22 answers · asked by robert g 1 in Biology

okey so the birthday paradox
i know that it states that within a random group of like 23 people that there is a 50 percent chance two pple will have the same birthday but idk if the number 23 is right ive check tons of pages n they r all different
i know its in the 20 but im not sure what number is right???

What is the real number????????

2007-11-27 09:28:30 · 8 answers · asked by Peach Mango 3 in Mathematics

sqrt ( 4n^2+3n+3) -2n * sqrt (4n^2+3n+3) +2n ...how does it simplify to 3n+3?

2007-11-27 09:26:50 · 5 answers · asked by tc 1 in Mathematics

2007-11-27 09:23:27 · 4 answers · asked by ComingOfAYGE 4 in Zoology

If given the trajectory equation as y=x*tan# - (g*x^2)/(2V^2*(cos#)^2)

where
y is the path of the trajectory
x is the horizontal distance
# is the angle it is launched at
g is gravity
V is launch velocity

how do you, using derivatives, find the equation to calculate the maximum height of an object being launch so that you can plug in velocity, gravity, and horizontal distance and equal the angle it should be launched at to reach maximum height

2007-11-27 09:23:06 · 2 answers · asked by chibiams 1 in Physics

a.breath in
b.urinate
c.breath out
d.both b and c

i not sure what the answer is but its one of them

2007-11-27 09:22:47 · 5 answers · asked by robert g 1 in Biology

2007-11-27 09:17:44 · 2 answers · asked by Anonymous in Mathematics

At the instant that it passes its initial position on its way down, a heavier marble is thrown verticaly downward from the same initial speed. which marble reach the ground first (neglect air friction)? why?

2007-11-27 09:17:26 · 5 answers · asked by Anonymous in Physics

Make a T-chart of the following and graph it, and tell me three things about the graph that do not include function information.
f (x) = -2^x (the x is superscript above the 2

I know how to make a T-chart, just pick numbers for x and solve for y. and graph it, am I correct? what would be the 3 things that are not functional information?
thanks if you can answer.

2007-11-27 09:15:49 · 1 answers · asked by Boo Radley 4 in Mathematics

I am trying to connect everything. so in the electromagnetic spectrum, i know that infrared and visible lights are thermal radiation. It also says that anything above absolute zero temperature emit thermal radiation. So does that mean other radiations in the electromagnetic spectrum are duet to thermal radiations??

2007-11-27 09:15:28 · 3 answers · asked by chika 1 in Physics

ok... e is euler's number

(e^x + e^-x)/2 = 3

I'm not sure how to solve this... because if you added em wouldn't it be e^0 = 6... but 1 doesn't equal three... and then i can't find x

there's a hint in my book that says

[Multiply each side by e^x.]... which just confuses me more.

2007-11-27 09:15:25 · 10 answers · asked by DONELDA M 1 in Mathematics

Suppose David puts a 0.40 kg rock into a sling of length 1.5 m and begins whirling the rock in a nearly horizontal circle above his head, accelerating it from rest to a rate of 110 rpm after 5.0 s. What is the torque required to achieve this feat?
__________ N·m

2007-11-27 09:14:13 · 1 answers · asked by hayleym425 2 in Physics

By how much will the device multiply the input force?

2007-11-27 09:14:12 · 3 answers · asked by Anonymous in Engineering

next solar system? How far is the next galaxy?

2007-11-27 09:10:57 · 3 answers · asked by Anonymous in Astronomy & Space

2007-11-27 09:09:59 · 6 answers · asked by ddrfreak25 1 in Physics

I am aware that the sun looks yellow from earth due to the atmospheric scattering of short wavelength (blue) light - the same reason that the daytime sky is blue. I am also aware that from space, where this effect does not occur, the sun appears white.

[a] Why, then, do the stars appear white when viewed through earth’s atmosphere? I understand that from such distances, the little bit of blue light that would be scattered wouldn’t light the nighttime sky or make it appear blue in color. But shouldn’t the little bit of starlight that passes through the atmosphere be yellowed like sunlight?

[b] Also, since twinkling of stars is an atmospheric effect like the shimmering mirages on the desert or those over hot asphalt - worse the warmer the night and the more active the atmosphere - why doesn’t the midday sun twinkle or shimmer when seen through our warm daytime atmosphere? Even low on the horizon when it is red and ditorted, it's still not "twinkling." Why just distant stars?

2007-11-27 09:09:09 · 5 answers · asked by Yaybob 7 in Astronomy & Space

is a triangle with 2 congruent sides and one with a measure of 90 degrees an isosceles triangle? i mean im pretty sure it is but just want to be sure! thanks!

2007-11-27 09:08:18 · 7 answers · asked by Anonymous in Mathematics

PLEASE HELP can you at least at answer 2
EXPERIMENT A

A selectively permeable membrane separates the solutions in the arms of the U-tube . the membrane is permeable to water and to substance A but not to substance B . forty grams of substance A and 20 g of substance B have been added to the water on the 2 of the U-tube. assume that after a period of time , the solutions on either side of the membrane have reached equilibrium.

1) How many grams of substance A will be in solution on side 1 of the U-tube ? How many grams of substance A will be in solution on the side 2 ? Explain .

2) How many grams of substance B will be in solution on side 1 of the U-tube ? How many grams of substance B will be in solution on the side 2 ? Explain .

3) What has happened to the water l;evel in the U- tube ? explain

THANKS IN ADVANCE

2007-11-27 09:07:28 · 2 answers · asked by sweethoney9079 4 in Biology

Hmm i'm not sure if i'm happy on how i've typed this- square root signs can be a pain here i guess...
Thanks

2007-11-27 09:07:23 · 4 answers · asked by Pink Undies 1 in Mathematics

My science teacher is scaring me so now i like reallllly want to know..... please help me!!!!

Thank you soooooo much!!

2007-11-27 09:07:07 · 5 answers · asked by DrtBkeChc93 1 in Earth Sciences & Geology