Science & Mathematics - 24 November 2007

how do I solve for h?

2007-11-24 18:06:02 · 7 answers · asked by Trisha 2 in Mathematics

2007-11-24 18:04:17 · 2 answers · asked by Anonymous in Chemistry

I like them, but I want to know more about them.

Please help?

2007-11-24 18:03:01 · 3 answers · asked by Ruben R 2 in Zoology

I need to know, as I am interested in this. also, does anyone know if I would have to become a neurologist first?

2007-11-24 17:59:26 · 1 answers · asked by 19 year old girl 2 in Other - Science

as i understand the newton's laws do not work at a subatomic level and i d kno why

2007-11-24 17:59:18 · 6 answers · asked by plolochufuu 2 in Physics

2007-11-24 17:56:28 · 2 answers · asked by sst307 1 in Geography

2007-11-24 17:44:02 · 9 answers · asked by yo yo 1 in Physics

How can someone with two copper wires can cause them to cross when over a well of water? (is that how they do it?)

2007-11-24 17:39:57 · 2 answers · asked by Be My Angel :] 4 in Other - Science

2007-11-24 17:39:09 · 6 answers · asked by Trisha 2 in Mathematics

Calculate the magnitude of the linear momentum for the following cases.
(a) a proton with mass 1.67 10-27 kg, moving with a speed of 5.65 106 m/s
=
????kg·m/s

(b) a 18.0 g bullet moving with a speed of 310 m/s
=??????????kg·m/s

(c) a 79.5 kg sprinter running with a speed of 10.5 m/s
=?????????kg·m/s

(d) the Earth (mass = 5.98 1024 kg) moving with an orbital speed equal to 2.98 104 m/s.
=????????? kg·m/s

2007-11-24 17:39:07 · 2 answers · asked by Dave 1 in Physics

Work Problems
1. 2 buses left a gasoline station at the same time and traveled in opposite directions with 1 bus traveling at 80kph and the other as 108kph.After how many hours will the 2 buses be 329 kilometers apart?
2. Raymond can load the truck in 40 minutes.If his son Alvin helps him,t takes them 15 minutes.How long will it take Alvin to finish alone?
3. 2 trains leave the same trminal at the same time and travel in opposite directions,with the 1st train traveling at a speed of 20km per hour faster than the other.After 5 hours,they are 700km apart.Find the speed each...
****Please give the Checking and the Solution

2007-11-24 17:35:04 · 9 answers · asked by AlyannA アリャンナ 2 in Mathematics

Current proofs of Pythagoras' theorem all do so through the comparison of areas of the triangles one way or another. I know of none that is able to prove the theorem using lines alone. As one of the few foundations of mathematics, the theorem holds a very important law, yet one which is too abstract for me to perceive. While the current proofs of the theorem do manage to prove it, they do not actually show why it is so, and do not explain the unique properties of lines, points and angles which give birth to this theorem. So I am wondering if there are any proofs which do not adopt the comparison of area. Otherwise, could anyone tell me why it is impossible to prove the theorem while not using area. What property of area calculation links it to the theorem and makes it the crucial key to proving it?

2007-11-24 17:32:55 · 4 answers · asked by CVA 2 in Mathematics

2007-11-24 17:30:44 · 6 answers · asked by arjune_00000 1 in Physics

When I was a child I suffered a lot of tonsil infections, at that time I was treated with tons of antibiotics, and eventually I was diagnosed with chronic tonsilitis, after several years of pain and suffering my tonsils were finally removed at age of 15. Then I started to live a "normal" life, so to speak. When I got my first job a hearing test was performed on me on a special isolated cabin, they did not tell me the result but it was obvious that it went wrong. However I never felt that I had hearing limitations and supposed the bad hearing test was due to old equipment. Since I am fully billingual and have good communications skills besides musical abilities, I really never noticed anything wrong, but since I married four years ago my wife keeps telling me that I am almost deaf and that I do not pay attention to her. WE FOUND I HAVE BAD HEARING!! and the worst: apparently I am slowly loosing hearing. haven't gone to the physician yet, but I wish to hear opinions. any hope?

2007-11-24 17:30:27 · 7 answers · asked by Manuelon 4 in Medicine

2007-11-24 17:29:40 · 10 answers · asked by nabs l 1 in Mathematics

DONT SAY NEITHER!!!!!!!!!!!!!!!!! id be a wolf because i hate moose. and i love wolves

2007-11-24 17:25:51 · 11 answers · asked by Yoga Wolf (Is A Woman!) 4 in Zoology

where 0<\x<\2pi

2007-11-24 17:22:07 · 4 answers · asked by Anonymous in Mathematics

1) x-3 / 10 = 4/5

2) 3/x +4 = 3/x

and expressing these in lowest terms:

x^2 - 5x / x^2 multiplied by x/ 2x-10

x^2 - 25 / 12 divide x^2 - 10x +25 / 4

2007-11-24 17:20:13 · 5 answers · asked by Anonymous in Mathematics

Even without invoking superstition or religion, the number 666 has many very curious properties - can it all be coincidence...?

http://en.wikipedia.org/wiki/666_(number)
* 666 is the sum of the first 36 natural numbers, and thus a triangular number. Since 36 is both square and triangular, it's also a doubly triangular number.

* 666 is the sum of the squares of the first seven primes:
666 = 2² +3² +5² +7² +11² +13² +17²

http://mathworld.wolfram.com/BeastNumber.html

* Golden ratio φ = -2 sin (666°) = - 2 cos(6*6*6°)
[Very fishy!?!]

* It's a sum and difference of the first three 6th powers
666 = 1^6 - 2^6 + 3^6

* There are (exactly) six 6s in 666^6

* Sum of all the numbers on a roulette wheel
* Sum of the first 144 digits of Pi
* Sum of Roman numerals from I to D is 666 (DCLXVI).

Other:
* The sum of the ASCII character codes for INDONESIA gives 666.
* "666" is the combination of the mysterious suitcase retrieved by Vincent Vega and Jules in Pulp Fiction.

2007-11-24 17:13:03 · 11 answers · asked by smci 7 in Mathematics

2007-11-24 17:11:43 · 21 answers · asked by muhammed u 1 in Biology

in a mixture of hydrogen and nitrogen gases at the same temperature?

2007-11-24 17:09:42 · 2 answers · asked by Chris 1 in Physics

2007-11-24 17:09:13 · 19 answers · asked by gossy 2 in Physics

Also help me how to solve that 3+2i and 3- 2i are in fact solutions.

2007-11-24 17:04:58 · 7 answers · asked by stephiewon 2 in Mathematics

2007-11-24 17:03:56 · 4 answers · asked by Anonymous in Astronomy & Space

A tennis club offers 2 payment options:

option 1:
$35 monthly fee plus $4/hr for court rental.
option 2 : no monthly fee but $6.50/hr for court rental. let x = hrs per month of court rental time.

A) write a mathmatical model representing the total monthly cost, C, in terms of x for the following?

option 1:_________
option 2:_________

B) how many hours would you have to rent the court so that monthly cost of option 1, is less than option 2. set up an inequality & show your work algebraically using the info in part A.

2007-11-24 17:03:44 · 6 answers · asked by Anonymous in Mathematics

i need chemistry help=]
Why do some reactions form solids in solution (precipitates), while others do not? Does the lack of a solid forming point to a non-reaction?

thanks

2007-11-24 16:58:46 · 2 answers · asked by confuzzled 1 in Chemistry

Predict the reactivity of the following substrates in both silver nitrate in ethanol (Sn1 conditions) and sodium iodide in acetone (Sn2 conditions):

1) 1-bromobutane
2) 1-bromo-2-butene

2007-11-24 16:56:48 · 1 answers · asked by James 1 in Chemistry

A metal has a specific heat capacity of .899 Jg-1K-1 How much energy is required to raise the temperature of 2.00 kg of the metal by 80 K?

(A) 80 kJ
(B) 35.96 kJ
(C) 179800 kJ
(D) 143.84 J
(E) 143.84 kJ

Please explain.

2007-11-24 16:54:38 · 1 answers · asked by Anonymous in Chemistry

A temperature of 20 degrees Celsius is equivalent to approximately?

a.-6 degrees Fahrenheit
b.32 degrees F
c.68 degrees F
d.136 degrees F

2007-11-24 16:46:24 · 9 answers · asked by BravesFanForLife 3 in Weather

You know the whole "no two are alike" thing? The only explanation I can come up with is "God made them" but...I want to know if there's a real reason.

2007-11-24 16:39:43 · 5 answers · asked by Anonymous in Physics