Science & Mathematics - 11 September 2007

Molecules in the retina respond to particular wavelengths of electromagnetic radiation - what we think of as visible light - and this is how we can see. Insects can see further into the EM spectrum than we can. Is it conceivable that an organ could evolve which has molecules, crystals or whatever that can transmit and receive radio wavelengths?

2007-09-11 23:43:04 · 6 answers · asked by Anonymous in Biology

2007-09-11 23:36:41 · 10 answers · asked by Anonymous in Mathematics

A room sized 3.32 m2 x 4.96 m2 = 16.47 m2 (£2.80 per m2) 16.47 x £2.80 = £46.11

How do I convert this sum in Sq feet.

2007-09-11 23:22:51 · 9 answers · asked by ra88ie 2 in Mathematics

I have a friend- she is being born after 3 died kids in the family and her mother stayed 9 months in hospital until she gave birth.
In mothers family there were in past generations people with some para qualities and my friend has also some abilities- she can guess about the weather, the herbs,the health, but the most interesting is to feel somehow where dangers are- could this be result from the fears and the empathy of her mother and is this a gift/present from mothers family?

2007-09-11 23:19:05 · 9 answers · asked by ThanksBelit 2 in Other - Alternative

The Thermoucoples are in SS sheath with MgO insulation but no thermo wells are provided.

2007-09-11 23:18:03 · 2 answers · asked by suresh k 1 in Engineering

Are we begining to glimpse the next dimension-Check out the odd shaped neverending hurricane above Saturn's north pole-AMAZING

2007-09-11 23:14:01 · 4 answers · asked by juststopit 2 in Astronomy & Space

2007-09-11 23:11:53 · 9 answers · asked by elsie a 1 in Mathematics

1. A 36-ft ladder rests against the edge of a roof. Four feet of the ladder's length extend beyond the edge of the roof, which is 28 ft above the ground level. Find the tangent and secant of the angle that the makes with the ground.

2. The angle of elevation from a point on the ground to the top of the pyramid is 35degrees 30 minutes. The angle of elevation from a point 135ft farther back to the top of the pyramid is 21 degrees. Find the height of the pyramid.

2007-09-11 22:59:33 · 4 answers · asked by Anonymous in Mathematics

2007-09-11 22:52:45 · 10 answers · asked by martins 2 in Geography

2007-09-11 22:50:25 · 11 answers · asked by Anonymous in Astronomy & Space

2007-09-11 22:45:45 · 8 answers · asked by journalist 1 in Astronomy & Space

I know that if f and g are functions which are continuous at the point x = a, then the sum of f + g is continuous at x = a. But if f & g are continuous for all real x, will the sum & division of both be continuous for all real x as well? I think no, but I don't know how to prove it >_<
1 more question. If f(x)=g(x), for x isn't equal to c and f(c) isn't equal to g(c), then f & g aren 't continuous...is this true?I think it's false, but i don't know what function should I use.

Help please!
Thank you very much!

2007-09-11 22:43:15 · 4 answers · asked by pucchihime 1 in Mathematics

We regularly hear about objects that travel faster than the speed of light, but I've never heard anything about the speed of dark. Does darkness travel or is it just static ?

2007-09-11 22:43:11 · 15 answers · asked by Anonymous in Physics

2007-09-11 22:39:55 · 6 answers · asked by Anonymous in Earth Sciences & Geology

A bath contains 100kg of water at60 dergee C. Holad and cold taps are then turned on to deliever 20kg per minute each at temperatures of 70 degree C and 10 degree C.Hw long will it be before the temperature in the bath has dropped to 45 degree C. ??????assume complete mixing of water n neglect heat losses.??????????????????

2007-09-11 22:30:59 · 3 answers · asked by iqnabeel 1 in Physics

i am talking about the actual toolbox not what is in it

2007-09-11 22:30:42 · 4 answers · asked by darty 3 in Engineering

when do u think is the end of the world ?why ask this?because of global warming and everything, if the world survice your expectation why do u think it did?

2007-09-11 22:16:42 · 9 answers · asked by Anonymous in Earth Sciences & Geology

I'm trying to follow an example solution, but having trouble with how the author got from:
1/[1+0.3e^(-0.276t)]
to
= [e^(0.276t)]/ [(e^(0.276t)) + 0.3]
How could this have been done?

2007-09-11 22:16:15 · 2 answers · asked by RogerDodger 1 in Mathematics

2007-09-11 22:15:44 · 1 answers · asked by Manogaran M 1 in Other - Science

PEOPLE HAVE EXISTED FOR 6,000 YEARS AND THEY STILL CANNOT STOP FOREST FIRE? IT IS STRANGE.
FIRE NEED OXYGEN, FUEL AND HEAT TO START. IF THEY REMOVE OXYGEN THEN FIRE CANNOT START. DO THEY HAVE A CHEMICAL THE SIZE OF THE HYDROGEN BOMB THAT CAN REMOVE OXYGEN A SIZE OF A FOOTBALL FIELD. I AM SURE THEY CAN STOP FIRE FROM SPREADING TO ALL FOREST THE SIZE OF A FOOTBALL FIELD. MAYBE, THE US GOVERNMENT COULD COME UP WITH SUCH SUPER BOMB TO STOP FOREST FIRE. BUT FIRST WE MUST GET THOSE PEOPLE OUT BY LOUD SPEAKERS.

2007-09-11 22:04:29 · 5 answers · asked by Anonymous in Earth Sciences & Geology

Delivery truck is required to make five stops on its morning route. Let X denote # of on-time deliveries for a given morning, let f denote probability mass function of X, and let F denote the cumulative distribution function of X. Historical data suggests that:

f_X (5) = 0.88, f_X (4) = 0.06, f_X (3) = 0.03, f_X (2) = 0.02, f_X (1) = 0.008, f_X (0) = 0.002

1. Construct cumulative distribution function of X.
2. Determine probability that truck makes at least 4 on-time deliveries.

Any help or advice on how to start solving this problem would be great. My professor is not great at explaining and most of the class is lost in this subject.

2007-09-11 21:59:39 · 2 answers · asked by Anonymous in Mathematics

2007-09-11 21:58:43 · 11 answers · asked by Jack 4 in Astronomy & Space

P(A) = 0.25, P(B) = 0.30, P(C) = 0.48, P(D) = 0.35
P(A n B) = 0.05, P(B n c) = 0.10, P(A n c) = 0, P(B n D) = 0

*D is a special case of C

1. The probability that has B but not A?
2. The probability does not have B but has A?
3. Does having D depend on whether or not patient has A?
4. Does having D depend on whether or not patient has C?

2007-09-11 21:49:54 · 3 answers · asked by Anonymous in Mathematics

2007-09-11 21:45:59 · 5 answers · asked by jubka1 2 in Biology

2007-09-11 21:44:45 · 4 answers · asked by platinumbutterfly713 1 in Mathematics

note that the negative after Oxygen denotes is a negative charge on it.
the same with sodium, it has a positive on it.

2007-09-11 21:42:21 · 2 answers · asked by Aldo M 1 in Chemistry

A cardiac monitor is used to measure the heart rate of a patient after surgery. It compiles the number of heartbeats after T minutes. When the data in the table are graphed, the slope of the tangent line represents the heart rate in beats pero minute. The monitor estimates this value by calculating the slope of a secant line. Use the data to estimate the patient's heart rate after 42 minutes using the secant line between the points with the given values of T. (give answers correct to 1 decimal place)

T (min)- --36-----38-----40-----42------44
HBeats--2526--2665--2803--2936--3070

a) T = 36 and T = 42
________________

b) T = 38 and T = 42
________________

c) T = 40 and T = 42
________________

d) T = 42 and T = 44
________________

2007-09-11 21:33:56 · 1 answers · asked by Rrrr0001 1 in Mathematics

they harm humans, they have to be combatted individually every time, so i think the FBI, or the CIA should step up and do the job they are paid for!

2007-09-11 21:30:09 · 3 answers · asked by ixat02 2 in Chemistry

3z +5 < -7/5z+4

solve the inequality for z. Simplify as much as possible.

2007-09-11 21:23:47 · 4 answers · asked by MTak 2 in Mathematics

y(squared)-3y-12

solve for y?

2007-09-11 21:22:52 · 3 answers · asked by MTak 2 in Mathematics