Science & Mathematics - 6 December 2006

Assume the area of an eardrum is about 4.9 x 10^-5 m^2. Find the sound power (energy per second) incident on an eardrum at the threshold of hearing (Io = 1 x 10^-12 W/m^2) in units of W.

Also, find the sound power incident on the eardrum at the threshold of pain (I1 = 1 W/m^2) in units of W.

2006-12-06 11:55:54 · 4 answers · asked by Anonymous in Physics

2006-12-06 11:55:52 · 5 answers · asked by Al F 1 in Astronomy & Space

2006-12-06 11:55:47 · 3 answers · asked by mimi 2 in Engineering

I have an idea for an invention that will be as life-changing as the cell phone, or computer. Once I get it patent, how do I get it built? I don't know how to build anything. How do I find a company that will manufacture them for me?

2006-12-06 11:54:36 · 14 answers · asked by Anonymous in Engineering

2radical2=radical u

2006-12-06 11:54:11 · 5 answers · asked by Anonymous in Mathematics

2006-12-06 11:54:00 · 5 answers · asked by Willem V 3 in Biology

questions

2006-12-06 11:53:30 · 1 answers · asked by ghani k 1 in Chemistry

I'm doing a project on then please, please help me, or else i'll get a big fat F on it.

2006-12-06 11:53:30 · 3 answers · asked by Boogers 2 in Astronomy & Space

Or magazines? I wanna know more about the relationship between cancer and these topics...Thanks a lot.

2006-12-06 11:51:40 · 2 answers · asked by Anonymous in Medicine

2006-12-06 11:51:16 · 2 answers · asked by Zada Butt 1 in Mathematics

2006-12-06 11:47:20 · 6 answers · asked by blahh 1 in Astronomy & Space

and thanks again to stephen if you help me out with this one hah

2006-12-06 11:46:15 · 1 answers · asked by Anonymous in Mathematics

2006-12-06 11:45:28 · 15 answers · asked by Traveler 4 in Zoology

I need to mix 8 oz of concentrate liquid into 1/2 gallon of water. How do I convert 8 oz into ml and gallon into Liter?

2006-12-06 11:44:38 · 7 answers · asked by siva 1 in Chemistry

plz answer using smaller words than the ones on really complicated books and stuff thanks

2006-12-06 11:44:24 · 5 answers · asked by Carla_M 1 in Physics

don't you feel worried about the climate and how the snow was deeper when you were younger, though funnily it didn't feel as cold though!!

2006-12-06 11:44:18 · 13 answers · asked by Andrew1968 5 in Weather

pressure is 742 mm Hg, the pressure rises to 976 mm Hg. The addition of more liquid carbon tetrachloride does not increase the pressure. What is the vapor pressure of CCl4 at 40*C

2006-12-06 11:43:52 · 1 answers · asked by power03stroke 1 in Chemistry

how would i solve
logx = 2log 3 + 3log 2 ???

2006-12-06 11:43:40 · 5 answers · asked by rachel123go 3 in Mathematics

2006-12-06 11:42:20 · 6 answers · asked by JSquare 1 in Biology

2006-12-06 11:40:11 · 2 answers · asked by Rob P 1 in Mathematics

2006-12-06 11:40:07 · 22 answers · asked by anmarie_smith 1 in Physics

mrs hossler is crazy!!!! help plz!!! ill thank you so much and give u points

2006-12-06 11:39:03 · 8 answers · asked by Anonymous in Mathematics

Please explain as easily in a step by step process.

2006-12-06 11:37:51 · 4 answers · asked by Anonymous in Chemistry

2006-12-06 11:37:14 · 1 answers · asked by .::Princess::. 1 in Biology

A large globe, with a radius of about 5m.
Imagine that such a globe has a radius R and a frictionless surface. A small block of mass m slides starts from rest at the very top of the globe and slides along the surface of the globe. The block leaves the surface of the globe when it reaches a height h above the ground.

Use the law of conservation of energy to find Vcrit??

I found Using Newton's 2nd law, that Vcrit the speed of the block at the critical moment when the block leaves the surface of the globe is V=sqrt(g(h-R))

Im trying to do some homeowrk but im stuck on this question can anyone help please.

2006-12-06 11:35:39 · 4 answers · asked by I S 1 in Physics

I came across this interesting fact the other day and confirmed it today. Basically the winter solstice is the shortest day of the year because when compared to the day before and the day after, the sun rises later than the sun sets earlier.

Beginning a few days ago and through December 15th are when the shortest sunlit afternoons occur.

So if you already knew this, please state how you came across the information.

2006-12-06 11:34:21 · 4 answers · asked by Anonymous in Astronomy & Space

A. Mg(s) + H20(l) ---> MgO (s) + H2(g)

B. H20(g) -----> H20(s)

C. 2CO(g) + O2(g) ---->2C02(g)

2006-12-06 11:33:10 · 1 answers · asked by lilsmartalecchick 1 in Chemistry

I need help with this math problem
If the product of 5 and a number is increased by 9 and this sum multiplied by 3, the result is 11 greater than the opposite of the number. Find the number.

2006-12-06 11:31:40 · 7 answers · asked by Anonymous in Mathematics

am working on a project 4 school and its abpout lights optics ans electrisity we have to use a minimunm of 30 lights or more we need to use 3 swiches or more we need to use a minimum of 3 circuts 2 parallel 1 series ans a minimum of 3 batteries max 21 volts no more thant 9aa c or d can anybody help and tell me how to connects all this

2006-12-06 11:28:54 · 1 answers · asked by help 1 in Engineering

2006-12-06 11:28:11 · 7 answers · asked by ? 5 in Astronomy & Space