Science & Mathematics - 28 June 2007

2007-06-28 12:25:59 · 12 answers · asked by Marc Hector 3 in Zoology

A jeweler has 5 rings, each weighting 18g, made of an alloy of 10% silver and 90% gold. He melts down the rings and wants to add enough silver to reduce the gold content to 75%. How much silver should he add.

The answer is 18 grams of silver i just need to figure out the equation how to get that answer.

2007-06-28 12:23:24 · 5 answers · asked by Girli3Dimpl3s 2 in Mathematics

A large room has 5 windows and each window is either open or closed. How many different arrangements of open and close windows are there?

The answer is 32 but I have no clue why because I though it would be 10. Thanks!

2007-06-28 12:22:45 · 6 answers · asked by Icobes 2 in Mathematics

2007-06-28 12:21:07 · 6 answers · asked by jack&me 2 in Mathematics

2x^2+10x+11=0

2007-06-28 12:21:02 · 6 answers · asked by Somebody 2 in Mathematics

Does all of the world see the same moon? Or, for an example, is it possible that Mexico see a waning gibbous and Finland see a full moon?

2007-06-28 12:16:39 · 6 answers · asked by Anonymous in Astronomy & Space

2007-06-28 12:09:34 · 6 answers · asked by Anonymous in Weather

I'm doing an experiment where I am shining an infrared LED through a single element lens (plano-convex lens) onto a surface which is about 3 inches away. I've placed a little square in front of the LED and I'm projecting the square image to the 3 inch surface. The square is nicely focused onto the surface however there are faint blobs of diffuse light emminating from the the squre edges. Can anyone please inform me as to the cause of this and if there is a solution with a single lens. Thank You.

2007-06-28 12:03:52 · 5 answers · asked by mrlexington 2 in Physics

2007-06-28 11:59:48 · 9 answers · asked by Anonymous in Mathematics

Is it possible for the moon to form as a twin planet and still be the moon. Imagine the moon being just like earth and being able to go between both.

Is that possible: Theortically?

2007-06-28 11:57:15 · 11 answers · asked by Ophiuchus 3 in Astronomy & Space

What is it and what does it feel like? I see the term used all over the internet.

2007-06-28 11:57:04 · 4 answers · asked by Anonymous in Medicine

A bubble with a volume of 1.00 cm3 forms at the bottom of a lake that is 20.0 m deep. The temperature at the bottom of the lake is 10.0°C. The bubble rises to the surface where the water temperature is 35.0°C. Assume that the bubble is small enough that its temperature always matches that of its surroundings. What is the volume of the bubble just before it breaks the surface of the water?

2007-06-28 11:54:09 · 3 answers · asked by Anonymous in Physics

I am trying to keep costs down this summer, especially my electricity bill.

2007-06-28 11:51:38 · 6 answers · asked by cocovan 1 in Engineering

Basically I'm trying to find out how far I can see out on Lake Huron, like how many miles untill the horizon. At ground level, not up in the air.

2007-06-28 11:50:16 · 3 answers · asked by Andrew 4 in Geography

In the period of a year, an investor lost twice as much as he gained. If he originally had $10,000 and how has $8000, what amount did he gain and what did he lose?
Could you please help me out with this problem and explain it to me?

2007-06-28 11:45:56 · 5 answers · asked by Anonymous in Mathematics

Complete the ordered pairs so that each is a solution for the given equation.

2007-06-28 11:40:48 · 5 answers · asked by Michael B 1 in Mathematics

There's alot of buzz lately about a guy in Florida who claims he's invented a new energy source. Most skeptics say whatever he's doing will use more energy than it releases. What do you think?

2007-06-28 11:40:22 · 3 answers · asked by Anonymous in Physics

Looking for testing services on the west coast, California, that can give % or PPM concentrations of the elements in a sample of solder. This is for RoHS verification of wave solder machine pots.

2007-06-28 11:37:14 · 2 answers · asked by DW 1 in Chemistry

Crows (and Pigeons) seem to spend a lot of time on the roads picking at the road-kill, but they invariably fly away just before a car reaches them. How do they achieve this? Is it because they only react to threats at a certain range, or can they estimate approach speed? Is it to do with the size of vehicle – in which case would they react later to a sports can than to a bus? Their road sense seems very well developed in comparison to many larger animals, such as rabbits, sheep and caravan owners.

2007-06-28 11:33:16 · 11 answers · asked by lotsmorewine 4 in Zoology

Specifically the higher apes kept in captivity. Im guessing that in the wild they wouldnt live much longer than the fertile age. Can you imagine a Gorilla with PMS or mood swings?

2007-06-28 11:29:52 · 4 answers · asked by nutter2b 3 in Zoology

wat is the fastest way i can get THC (pot) outta my system

2007-06-28 11:29:17 · 11 answers · asked by Anonymous in Medicine

Specifically the higher apes kept in captivity. Im guessing that in the wild they wouldnt live much longer than the fertile age. Can you imagine a Gorilla with PMS or mood swings?

2007-06-28 11:28:50 · 2 answers · asked by nutter2b 3 in Zoology

Specifically the higher apes kept in captivity. Im guessing that in the wild they wouldnt live much longer than the fertile age. Can you imagine a Gorilla with PMS or mood swings?

2007-06-28 11:28:21 · 1 answers · asked by nutter2b 3 in Zoology

v(t)= sqrt[ gm/k ] tanh[ (kg/m)t ]

2007-06-28 11:22:28 · 4 answers · asked by azulita 3 in Mathematics

a. Find x if AC = 3x - 1 and BC = 12 - x.

b. Use the answer for x to find the value of AB.

I want explanation not just answer please and thank you =)

2007-06-28 11:22:24 · 6 answers · asked by love 1 in Mathematics

Is there a limit or a line that can't be crossed or can a scientist simply not be allowed to imagine to make a scientific theory such as, you know....

2007-06-28 11:21:28 · 5 answers · asked by tarquinn j 1 in Physics

2x-1
-x+1
------- how can i add this?

2007-06-28 11:21:01 · 5 answers · asked by Anonymous in Mathematics

Is there a limit or a line that can't be crossed or can a scientist simply not be allowed to imagine to make a scientific theory such as, you know....

2007-06-28 11:20:57 · 6 answers · asked by tarquinn j 1 in Astronomy & Space

i want to know cause me and my fam is diccusing......we all have no idea!!!!!!!!!!1

2007-06-28 11:19:22 · 8 answers · asked by eneida96 1 in Chemistry

see above...

2007-06-28 11:18:58 · 1 answers · asked by Video Game Scientist 1 in Other - Science