Science & Mathematics - 24 August 2007

The Cactus Railway runs east and west. Dry Gulch is situated exactly 30 miles south of mile marker 70. Seco City is situated exactly 20 miles south of mile marker 190.
Where should a train station be built so that the sum of the distances to the two towns to the station is mimimum ?

2007-08-24 04:34:44 · 2 answers · asked by William B 4 in Mathematics

Why is it that everyone is against hybrids in different species such as birds and dogs. Their argument is that they want to 'preserve' certain species. for instance some macaws are said to be endangered species so it is frowned upon to breed hybrid macaws (ie a blue & gold to a greenwing to get a harlequin) . However, these same people encourage the breeding of hybrid humans? Why is it ok to breed some animals while the very thought of limiting other animals (ie humans) is extremely politically incorrect? Why is one species important to protect and preserve while other animals are not?

2007-08-24 04:30:23 · 4 answers · asked by reowrrrr 2 in Biology

http://i40.photobucket.com/albums/e215/xxs3xp1stolxx/Picture1.png

2007-08-24 04:29:58 · 3 answers · asked by Anonymous in Mathematics

If you are logical than give me your answer in detail and it should be scientific !

2007-08-24 04:25:40 · 17 answers · asked by Kashif E 3 in Astronomy & Space

I have researched about other unknown black holes and they are the opposite with time changing effects so I want your logical opinion

2007-08-24 04:25:16 · 15 answers · asked by Steven D 2 in Astronomy & Space

My friend ask me this question and i dunno the answer...

2007-08-24 04:18:09 · 17 answers · asked by merck 2 in Astronomy & Space

please explain

2007-08-24 04:17:16 · 4 answers · asked by Grand Phuba 5 in Physics

If a passenger train departs station x traveling at light speed and another train leaving station y at 1 mile an hour, at what point will they collide? (you many use your calculator for this problem)

2007-08-24 04:17:15 · 3 answers · asked by reido_sakaiya 1 in Physics

already, but since it takes bunches of years for their light to reach us, how would we ever know?.... then we could be living inside the remains of a defunct universe.....we could live out our lives and never realize it was all over but the shoutin'....??

discuss, please?

2007-08-24 04:13:59 · 26 answers · asked by meanolmaw 7 in Astronomy & Space

I want answers!

2007-08-24 04:13:47 · 7 answers · asked by Anonymous in Geography

2007-08-24 04:11:48 · 2 answers · asked by Anonymous in Zoology

I used to go to a website that tells you where all the planets are in the sky and I would go outside and look for them. I've seen just about all of them except pluto. But I don't remember the website name.. anyone know of a website thats kind of like this that shows you where they are?? The site I used to go to was called skywatch, skynet or something like that.

2007-08-24 04:09:55 · 7 answers · asked by MedTq367 6 in Astronomy & Space

the question:

the current in a 3.5H(henry) inducator increses uniformly from zero to 50 mA in 500 ms.
determine the e.m.f.,and the stored energy at the end of this time?

help i have no clue =| and thats all ive been given
cheers

2007-08-24 03:59:16 · 2 answers · asked by london lad 1 in Physics

Nasa is also blurring out pictures before they go on sattilite images and astranauts said they saw things on the moon.

2007-08-24 03:57:29 · 8 answers · asked by LGA1155 1 in Astronomy & Space

I am absolutely stumped regarding this questions. Could someone please assist me? I would be extremely grateful.

A runner is jogging at a steady v = 8.4 km/hr. When the runner is L = 4.9 km from the finish line, a bird begins flying from the runner to the finish line at V = 16.8 km/hr (2 times as fast as the runner). When the bird reaches the finish line, it turns around and flies back to the runner. We will assume that the bird occupies only one point in space, ie., a zero length bird.

How far does the bird travel? Answer in units of km.

ALSO:

After this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. The bird repeats the back and forth trips until the runner reaches the finish line.

How far does the bird travel from the beginning? (ie include the distance traveled to the first encounter) Answer in units of km.

2007-08-24 03:55:28 · 4 answers · asked by sg88 1 in Mathematics

I am absolutely stumped regarding this questions. Could someone please assist me? I would be extremely grateful.

A runner is jogging at a steady v = 8.4 km/hr. When the runner is L = 4.9 km from the finish line, a bird begins flying from the runner to the finish line at V = 16.8 km/hr (2 times as fast as the runner). When the bird reaches the finish line, it turns around and flies back to the runner. We will assume that the bird occupies only one point in space, ie., a zero length bird.

How far does the bird travel? Answer in units of km.

ALSO:

After this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. The bird repeats the back and forth trips until the runner reaches the finish line.

How far does the bird travel from the beginning? (ie include the distance traveled to the first encounter) Answer in units of km.

2007-08-24 03:54:04 · 3 answers · asked by sg88 1 in Physics

Hey.

I need some help on the volume of a Cylinder. Let's say that the height is 1.1m and the diamter is 90cm. In my mathematics book the answer is 0.70cm3.

If i were in an examination and i the exact question could i put the answer down as 70cm3? Or does it have to be exactly 0.70cm3? By the way could someone be kind enough to tell me how to get 0.70cm3? What do i round off?

Thanks.

2007-08-24 03:48:41 · 12 answers · asked by Jay Garrick 1 in Mathematics

Is there a similar law like the Law of Boyle (Robert Boyle 1661) that works for fluids?
I would like to know if the temperature of water increases if I increase the pressure from 1 atm to 10 atm. e.g.

2007-08-24 03:44:15 · 2 answers · asked by Greek Oracle 4 in Physics

does it vary or is there an average number?

2007-08-24 03:42:03 · 9 answers · asked by rr 1 in Biology

Josephine works part-time in a local video store. Her salary varies directly as the number of hours worked. Last week she earned $43.20 for working 8 hours. This week she earned $118.80. How many hours did she work this week?

2007-08-24 03:32:26 · 6 answers · asked by too_b2000 1 in Mathematics

I'm having trouble solving my last question on my summer assignment:

Derive sin2x + cos2x = 1

with only using

cos(x + y) = (cosx)(cosy) - (sinx)(siny)
sin(-x) = -sinx
cos(-x) = cosx
cos0 = 1

Please explain how to solve the problem. Thank You.

2007-08-24 03:30:01 · 4 answers · asked by senseless.student 1 in Mathematics

What is your average velocity?

2007-08-24 03:28:00 · 3 answers · asked by Wonder 2 in Physics

2007-08-24 03:24:36 · 4 answers · asked by PriencessJasmine 1 in Chemistry

2007-08-24 03:24:29 · 5 answers · asked by Anon 3 in Botany

I have to solve this quadratic equation by completing the square. This is as far as I have gotten.

2x^2 +10x + 11=0
2x^2 + 10x = -11
2x^2/2 + 10x/2 = -11/2
x^2 + 5x = -11/2
x^2 + 5x + 1 = -11/2 + 1
(x + )^2 = sqrt -9/2~this is where I am stuck.
I don't know what else to do after this...can some one help me out?

2007-08-24 03:21:41 · 5 answers · asked by jrseeg1rl 2 in Mathematics

Mary has just purchased a car for AED 124,000. She paid 50% as a down payment and borrowed the remainder from the bank at a discount rate of 12% compounded monthly over 20 months.

1. How much does Maryam pay the bank each month? 3435.75

2. How much is her last payment? 3435.16

3. How much is paid in total for the car? 130714.41

4. How much of that is interest? 6714.41

I only figured out how to get the first one... the others, i dont.. so i need some help on it ^^!

2007-08-24 03:19:48 · 3 answers · asked by Yuuji 1 in Mathematics

2007-08-24 03:18:14 · 5 answers · asked by Abubaker A 1 in Engineering

On Ghosthunters,the electronic device batteries are quickly drained .This is said to be entities absorbing the energy.Why not bring a couple of car or truck batteries along.The ghosts wouldn't notice C, D or AA"s.with those around.Then they could investigate longer.Do ghosts only absorb DC?What about the AC in wall sockets?

2007-08-24 03:13:29 · 8 answers · asked by Dr. NG 7 in Paranormal Phenomena

Might teleportation achieve this, for example?

2007-08-24 03:06:08 · 11 answers · asked by Buzzard 7 in Physics

Solve by the quadratic formula.

4k^2 +2k +5 = 0

You can use complex numbers. i = rt-1

2007-08-24 03:03:58 · 2 answers · asked by Anonymous in Mathematics