Science & Mathematics - 27 August 2007

About a month ago, I was watching the stars and the moon, and notices that all of a sudden, the moon changed phases. I mean instantaneously, the shadow moved. I looked it up, and i found no references to it, but i found out that the particular movement of the shadow meant that it swiched to a week in the future. I know what i saw, and im not asking people to tell me im on crack or anything. I want to know if anyone else notices, so far, i think im the only one, how can this be?

2007-08-27 08:06:51 · 5 answers · asked by Anonymous in Astronomy & Space

like i got a mail taht on the 27 mars will come along with the moon and that we can see it
is it true

2007-08-27 08:04:19 · 7 answers · asked by ? 3 in Astronomy & Space

For the next problems you will need to come up with an equation for the quantity you are trying to minimize in terms of a single independent variable. then i would like you to graph the function on your calculator and use the "calculate minimum" capability of the calculator to find the answer.

1)A solid is formed by adjoining two hemispheres to the ends of a right circular cylinder. The total volume of the solid is 12 cubic centimeters. find radius of cylinder that produces the minimum surface area.
2) An industrial tank of the same shape in (1) must have a volume of 3000 cubic feet. The hemispherical ends cost twice as much per square foot of surface area as the sides. Find the dimensions that will minimize cost.

my teacher gave me that can please some one help because i don't know where to start! Thanx!

please anyone help!
i realy need this thanx

for 1) i need radius
i cant solve for h

2007-08-27 08:04:10 · 5 answers · asked by The Answer 3 in Mathematics

factor the poloynomial. this is far as i have gotten:

49x^4-16a^2

(7x^2+4a)(7x^2-4a)

(7x^2+4a)(7x+2a)(7x-2a)...this is where i am stuck

2007-08-27 08:03:14 · 8 answers · asked by arod_69 1 in Mathematics

2007-08-27 08:01:44 · 6 answers · asked by harry2002dog 1 in Astronomy & Space

Is all the extra weight that the American populous is carrying around a significant amount of carbon? If every person in America became optimal weight what would be resultant effect on the environment? Where would all that mass go? Into the air as CO2 or into the sewer as solid waste? Or does it not matter because most of the weight is H2O because the human body is over 90% H2O?

2007-08-27 07:55:05 · 3 answers · asked by tmiv 1 in Biology

Solve this equation please! I'm trying to learn algebra

2007-08-27 07:52:24 · 8 answers · asked by Anonymous in Mathematics

2007-08-27 07:49:18 · 10 answers · asked by Anonymous in Astronomy & Space

they say that Mars ll get close to the earth so we ll can c it as a moon is it true?

2007-08-27 07:49:15 · 7 answers · asked by ragda2 2 in Astronomy & Space

there are rumours that NASA is all fake. man did not go to moon. it was just some fake pictures taken somewhere in the underground. in my opinion, this sort of seems to be true but i can't quite agree. what about you?

2007-08-27 07:48:09 · 37 answers · asked by Seungyong W 5 in Astronomy & Space

Do interns make any money, or do they work for free? I am pursuing a degree in electrical engineering. What should I look for?

2007-08-27 07:48:08 · 2 answers · asked by Ann P 1 in Engineering

2007-08-27 07:47:27 · 10 answers · asked by Alexander 6 in Physics

2007-08-27 07:46:16 · 3 answers · asked by Shaggy 3 in Engineering

2007-08-27 07:42:48 · 6 answers · asked by Anonymous in Earth Sciences & Geology

(2/3y) + (1/4) =1

Thank you

2007-08-27 07:31:15 · 5 answers · asked by Gator Girl 5 in Mathematics

Mary does like to Rock

2007-08-27 07:30:00 · 7 answers · asked by Anonymous in Biology

I got no idea what it is.

2007-08-27 07:22:33 · 14 answers · asked by momocheet 1 in Geography

The Earth rotates eastward at speed s=500m/s at equator. Airplane flies in due west direction along equator at speed v=s=500m/s wrt earth.

********
When I do this problem in the frame of refence rotating with the earth, then:

forces acting on the plane are:
gravity mg (downwards)
centrifugal force mω²R = ms²/R (upwards)
airlift F (upwards)

dynamic equation for the airplane is
ma = F - mg + ms²/R
Accleration a is centripetal accleration:
a = -v²/R (minus signifies downward direction)
Final equation for airlift:
****************
F = m(g - 2s²/R)
****************

But when I consider this problem in inertial frame of reference, the airplane is at rest, and I get simply
****************
F = mg
****************

2007-08-27 07:18:39 · 4 answers · asked by Alexander 6 in Physics

2007-08-27 07:13:39 · 4 answers · asked by dac05@sbcglobal.net 1 in Astronomy & Space

Does anyone make a form-in-place gasketmaker or gasket sealant that is resistant to fuel (kerosene) and at temps up to 300 degrees F? I need something to hold a nomex gasket to a steel flange that can hold the gasket on, despite repeated assembly and disassembly.

2007-08-27 07:13:19 · 2 answers · asked by smartman300 2 in Engineering

i mean why are short dipoles used ?why should they be of length (lambda / 2)?

2007-08-27 07:12:41 · 3 answers · asked by sharat chandra 1 in Engineering

Suppose you are given the formula (y+3)/4 = ± (x+2)/9 for the asymptotes of a hyperbola. What is the formula for the hyperbola?
Specifically, can you tell how this hyperbola opens? Can you tell if it opens up-down, or to the sides?

2007-08-27 07:09:46 · 2 answers · asked by Anonymous in Mathematics

♥ I placed a bowl of ice cream very gently on the ground and suddenly the glass bowl shattered! Can you explain this?

Is there any scientific reasoning behind this event. I understand that this incident is not significant, however, I would just like to comprehend the reasoning behind it.

Thank you to all! ♥

2007-08-27 07:06:39 · 18 answers · asked by Nicole S 2 in Physics

Show this inequality:

(cos x)^(cos x)>(sin x)^(sin x)

0

2007-08-27 06:56:42 · 3 answers · asked by Amir 1 in Mathematics

What is considered an acre?

2007-08-27 06:46:08 · 7 answers · asked by Butterfly 1 in Mathematics

2007-08-27 06:45:40 · 9 answers · asked by labingbob 1 in Botany

2007-08-27 06:44:05 · 1 answers · asked by Yoshi 3 in Chemistry

Find the center and radius for the circle defined by the equation x^2 + y^2 + 4x - 6y + 11 = 0

2007-08-27 06:39:59 · 3 answers · asked by Softball_Super_Star17 3 in Mathematics

There appears to be a rule in physics that you cannot get something for nothing. The creation of space as the universe expands seems to contradict this rule unless some related attribute is running down

2007-08-27 06:39:46 · 4 answers · asked by Anonymous in Astronomy & Space

call them a hippobottomous????? is this corny or what????ha ha ha ha ha

2007-08-27 06:39:28 · 1 answers · asked by Anonymous in Zoology