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Science & Mathematics - 2 November 2007

[Selected]: All categories Science & Mathematics

Agriculture · Alternative · Astronomy & Space · Biology · Botany · Chemistry · Earth Sciences & Geology · Engineering · Geography · Mathematics · Medicine · Other - Science · Physics · Weather · Zoology

2007-11-02 08:04:08 · 6 answers · asked by Jenny D 1 in Mathematics

1. Find the dimensions of the right circular cylinder with greatest volume that can be contained in a sphere of radius 1.

2.
What is the largest (by area) rectangle with sides parallel to the coordinate axes that can be contained in the region of the plane bounded by the graphs of y=0, y=x (1-E^(x/x-1)) and x=1?

2007-11-02 08:02:31 · 1 answers · asked by swimmerxc 3 in Mathematics

For instance, how does it know that a specific nerve termination comes from my left foot and not from the tip of my nose?

2007-11-02 08:02:30 · 4 answers · asked by FreeSpirit 4 in Medicine

it was to be in the wild... maybe something no one would pick

2007-11-02 07:57:28 · 7 answers · asked by audrina 1 in Zoology

2007-11-02 07:56:13 · 13 answers · asked by Duck 1 in Agriculture

http://www.asp.bnl.gov/

Nice logo at the top...

2007-11-02 07:54:12 · 4 answers · asked by Anonymous in Weather

A. a mushroom
B. yeast
C.a smut
D.a spore

2007-11-02 07:53:46 · 3 answers · asked by logan_9771 1 in Botany

I've heard many times that plants feel emotions but their sounds cannot be detected by the human ear. Is this true? Has it been scientifically proven?

2007-11-02 07:53:17 · 26 answers · asked by Anonymous in Botany

find the absolute min at: f(x) = x^6(x-2)^7 on interval (-12,14)

2007-11-02 07:50:58 · 4 answers · asked by samantha 5 in Mathematics

are super-massive black holes responsible for the spiral shapes of galaxies?
thanks

2007-11-02 07:50:31 · 3 answers · asked by turk6060 3 in Astronomy & Space

I know it is 90% Au and 10% Cu - roughly
But I need the chemical formula.

2007-11-02 07:48:36 · 4 answers · asked by Cryst17 2 in Chemistry

I know that the evolution of the animal kingdom has been and continues to be studied, but I am wondering about the evolution of plant life. If all living matter evolved from the same organism, has anyone studied where plant life broke off from animal life and how plants are related?

2007-11-02 07:47:49 · 14 answers · asked by Anonymous in Botany

If f = {(1,0),(-4,3),(0,-3)} then f-1 is

A) the inverse of f which is {(-1,0),(4,-3),(0,3)}.
B) the reciprocal of f which is 1/f.
C) the reciprocal of f which is -f.
D) the inverse of f which is{(0,1),(3,-4),(-3,0)}.

2007-11-02 07:45:39 · 4 answers · asked by Anonymous in Mathematics

antibiotics like penicillin , ampicillin and keflex are not? Why can we not get cheap over the counter antibiotics in this country? It is a shame that when you don't have insurance and can't afford a doctor for an infection, that you have no inexpensive alternative, don't you think? These drugs have been proven safe and effective much longer than some of the other drugs that have been approved for OTCs. A medical conspiracy I think.

2007-11-02 07:45:26 · 1 answers · asked by Anonymous in Medicine

Im a 9th grader from chennai, india. we dont do calculus this year, but Im extremey interested in learning calculus and trigonometry. Unfortunately, NONE of the books/cd's/webpages i looked at actually explained calculus to a complete beginner. can someone please give an email of a math teacher/ tell me about limit/slope/,etcetc, like for a complete beginner whos got very little idea even about trigonometry? i mean, a direct way to learn the concepts from the beginning, understanding EVERYTHING easily? I am really desperate. Could someone please help out?

2007-11-02 07:44:18 · 8 answers · asked by Vishruth V 1 in Mathematics

If the weight of a uniform boom is 2.00 kN, the tension in the horizontal guy wire supporting the boom a 5.60 kN weight is....?
Also given the length of the boom is 10 m and the height of the guy wire from the horizontal is 4 m.

Any help is appreciated - I have absolutely no idea what to do with this!

2007-11-02 07:43:51 · 1 answers · asked by emuhlee15 2 in Physics

I am really confused and any help would be greatly appreciated thanks.

Find dy/dx by implicit differentiation:
1) 1 + x = sin (xy^2)
dy/dx=?
2) 7x^3 + x^2 y - xy^3 = 4
dy/dx=?

Also if you can help me on this
3) use implicit differentiation to find an equation of the tangent line to the hyperbola @ pt (1,4)

x^2 + 2xy - y^2 + x = -6
y(x)=?

Thank you so much for any help you can give. I have attempted all of them but am unable to get help from my teacher. Please don't just give me the answers, I need an explanation of how to do it.

2007-11-02 07:42:14 · 3 answers · asked by bballchic6798 2 in Mathematics

The diagram is a picture of a acute triangle and I have to find the angle of it, but it's a bit more complicated. There is a 3.7kg mass on the surface of the inclined plane and is connected to a 2kg mass and the pulley and string are massless and have no friction. The 2kg mass is acted upon by an upward force of 3.9N and has a downward acceleration of 4.6m/s^2. I found the tension in the connecting string and that 6.5N. What I don't get is how to find the angle and someone tried helping but what they did was 4.6=gsintheta but that was wrong.

2007-11-02 07:38:55 · 1 answers · asked by tanya 1 in Physics

P(x) = 4-[x-5] / 16 for x= 2,4,6,8,10 ([these show absolute sign] )-. Find the mean and sd. I want to figure it out for myself, I just can't get started.

2007-11-02 07:34:21 · 1 answers · asked by andrison 1 in Mathematics

By means of a rope whose mass is negligible, two blocks are suspended over a pulley, as the drawing shows, with m1 = 10.3 kg and m2 = 43.4 kg. The pulley can be treated as a uniform, solid, cylindrical disk. The downward acceleration of the 43.4 kg block is observed to be exactly one-half the acceleration due to gravity. Noting that the tension in the rope is not the same on each side of the pulley, find the mass of the pulley.
______kg

http://www.webassign.net/CJ/p9-42alt.gif

2007-11-02 07:30:15 · 1 answers · asked by Anonymous in Physics

or is it not limited by oxygen? scientific sources would be also appreciated thanks!

2007-11-02 07:30:02 · 3 answers · asked by keyahnoo 2 in Medicine

The moon has many interesting features, like it-s own rotation matching precisely the earths and thus showing us the same face all the time. But one thing I'm not suer is if there is a physical or mathematical reason why the moon eclipses the sun so perfectly (even when it lets a small ring of sun to show), or if it is just a very nice coincidence on it's size and distance from the earth to give us such beautiful events?

2007-11-02 07:29:15 · 7 answers · asked by Ricardo A 3 in Astronomy & Space

A rotating door is made from four rectangular glass panes, as shown in the drawing. The mass of each pane is 82 kg. A person pushes on the outer edge of one pane with a force of F = 76 N that is directed perpendicular to the pane. Determine the magnitude of the door's angular acceleration.
________rad/s^2

http://www.webassign.net/CJ/09_34.gif

2007-11-02 07:27:55 · 1 answers · asked by Anonymous in Physics

I have killed two of these spiders in my house in the last week. I just want to know what kind it is and if my family is in any danger from these.
http://www.flickr.com/photos/17349760@N04/1829446639/

Thank you

2007-11-02 07:26:47 · 5 answers · asked by netizen p 2 in Zoology

2007-11-02 07:24:31 · 5 answers · asked by Anonymous in Botany

what is the absolute location of belarus?

2007-11-02 07:21:48 · 10 answers · asked by yawn 1 in Geography

2007-11-02 07:21:34 · 1 answers · asked by Anonymous in Chemistry

fedest.com, questions and answers