All categories - 30 April 2007

Problem 31.41
What value resistor will discharge a 2.70 microFarads capacitor to 20.0 % of its initial charge in 2.10 ms? Answer in ohms

2007-04-30 15:49:29 · 1 answers · asked by MattS 1 in Physics

"The half-life a carbon 14 is 5600 yrs. How old is a fossil that contains 25% of the normal proportion of carbon 12 to carbon 14" please explain how you solve for this

2007-04-30 15:49:24 · 2 answers · asked by jbljackie 2 in Chemistry

Three identical capacitors are connected so that their maximum equivalent capacitance is 15 micro Farads.

(a) Describe how the capacitors are combined.
(b) There are three other ways to combine all three capacitors in a circuit. What are the equivalent capacitances for each arrangement?

2007-04-30 15:49:11 · 1 answers · asked by hpage 3 in Physics

2007-04-30 15:49:08 · 7 answers · asked by Anonymous in Diet & Fitness

2007-04-30 15:49:07 · 26 answers · asked by Anonymous in Polls & Surveys

Can you translate these words for me
water fountain
bathroom
men
women
closet
radio
i pod
vending machine

2007-04-30 15:49:01 · 7 answers · asked by Anonymous in Languages

i am getting a tattoo of two hands making a heart, looks something like this http://img.photobucket.com/albums/v515/brennanslove/handheart.jpg itll be all black and white so no color and probly somewhere around the size of a CD on my lower back. i know all shops charge diffrent but its my birthday present from my mom and dad so i need something close before i bother going into the shop, i just need something ruff for this tat

2007-04-30 15:48:59 · 11 answers · asked by Anonymous in Tattoos

Hydrogen gas was produced by reacting magnesium metal with hydrochloric acid, 45.0 milileters of gas was produced from the reaction of .0250 grams of magnesium. The gas was collected at a temperature of 25 degrees celsius and the room pressure was 750 mm Hg (Vapor pressure of water @ 25 degree celsius= 21.3 mm Hg)


What is the pressure of hydrogen?

What was the volume of hyrdogen gas?
How many moles of magnesium were used to produce the hydrogen gas?

What is the volume of the hydrogen gas per one mole of magnesium at STP?

Thanks

2007-04-30 15:48:49 · 1 answers · asked by blinkingtrees 2 in Chemistry

Im trying to go into meteorology and Im in Iowa. I have gotten only one invite to visit a University. it is from Oklahoma University(OU).
What should I chose a University in Iowa or oklahoma...???

2007-04-30 15:48:33 · 3 answers · asked by j l 2 in Higher Education (University +)

Mine is Timberland.

2007-04-30 15:48:21 · 21 answers · asked by atcblue05 6 in Polls & Surveys

Could it be the Great Khali who knocked out Shawn Michaels and Edge and Randy Orton??? Who will be the next victim tonight???

2007-04-30 15:48:04 · 9 answers · asked by Kane 4 in Wrestling

2007-04-30 15:48:03 · 6 answers · asked by Ted 7 in Mental Health

I am replacing my roof with an asphalt shingle roof. I read on the internet in a few places that lighter colored shingles last longer as they deflect heat better. I also read it's more relevant in the south then the north, since it's hot more often.

I live in the northeast, and was just wondering if this was true, AND how much difference does it make?
I mean, are we talking about extending the roof life a month or years?

Personally I like darker colored roofs style wise better, but if it made a huge difference it seems silly to choose to lower the life of the roof for just the color.

Thanks!

2007-04-30 15:47:44 · 9 answers · asked by accorn34 5 in Maintenance & Repairs

If it is less than 300 dollars, Just say don't do it

2007-04-30 15:47:27 · 5 answers · asked by kfckiller06 3 in United States

The rontgen or roentgen (R) is a unit of measurement of ionizing radiation in air, either X or gamma rays. It is named after the German physicist Wilhelm Rontgen. A roentgen is the amount of radiation required to liberate a pair of positive and negative charges from atoms of one electrostatic unit of charge in 1.00 cm3 of air at standard temperature and pressure. This corresponds to the generation of approximately 2.08 × 109 ion pairs. A dose of 500 R in five hours is lethal for humans.



If X radiation ionizes 20.4 × 1013 atoms per cemtimeter cubed, what is the ionizing intensity of the radiation measured in roentgens ?

2007-04-30 15:47:15 · 1 answers · asked by woj87marta 1 in Chemistry

I think they should stay illegal because a big sum of them get drunk being illegal and they cause accidents and kill innocent people and they stay like if nothing happend my opinion is that they should stay on Mexico causing all accident over there and making tacos over there. Is not that I don't like Mexican is just that they come to our territory to cause problems.

2007-04-30 15:47:04 · 47 answers · asked by Anonymous in Polls & Surveys

It's going to be really expensive and I just don't have the money to fork out for clothes, travelling, gifts etc.

2007-04-30 15:46:33 · 34 answers · asked by Anonymous in Weddings

any websites you know that allow that sort of thing.
Or any information that would allow me to do it over the phone.

2007-04-30 15:46:14 · 5 answers · asked by Rosario 1 in Homework Help

i started the nuva ring 1 month ago because im getting married on may 26th and didnt want to get pregnant/regualte my period so i wouldnt have it on my wedding day. I followed the doc's directions on when to put it in and to take it out, but that left me with my period on my wedding. The docs soulution was to skip my period for the 1st and 2nd month by leaving it in for an extra week and then putting the new one stright in. so anyways, its the end of month one and 10 days ago i started spotting and im supposed to put the new one in 5 days, and if this follows the same next month i will be all spotty on my wedding and honeymoon :( is there anyway to avoid the spotting? has anyone just spotted for there 1st month? :(

2007-04-30 15:45:53 · 1 answers · asked by Due nov 6th 2 in Women's Health

2007-04-30 15:45:48 · 52 answers · asked by Sar 3 in Polls & Surveys

Whats the harm in doing a few lines of coke at a party, a few lines wouldn't kill me. I asked my cousin if he's ever tried coke and he said no, then he said, "I better not ever catch you doing coke, if I ever catch you doing coke, I will break every bone in your body." I don't she why he cares since he has done extacy in the past. He somehow believes coke is worse then extacy. Hes like, you can die the first time for doing coke. I think its the other way around. If my cousin has done X, then why would he do if I do a few lines of coke at a party.

2007-04-30 15:45:39 · 18 answers · asked by Anonymous in Psychology

2007-04-30 15:45:29 · 10 answers · asked by santiman123 1 in Military

i'm working on a project for my history class and i need to find the trade routes of the Columbian Exchange. i've looked online but i can't find anything. I need to find the movements of livestock (horses, cattle, sheep, pigs), foods (potatoes, corn, tomatoes, chilies, pumpkin, wheat, sugar cane, cocoa beans, tobacco, peanuts), diseases (small pox & measles), and people (slaves). This trade consists of the exchange from the Old World to the New World. Please help if you can, it would be very much appreciated.

2007-04-30 15:45:27 · 1 answers · asked by Anonymous in Homework Help

Going to NYC this summer...what are some Do's and Don'ts??

2007-04-30 15:45:19 · 9 answers · asked by demons320 1 in New York City

Calculate the binding energy per nucleon for the following isotopes: 11B 57Co 64Zn 78Se

i just need to see the formula for this because everything im doing is wrong. help....

2007-04-30 15:45:12 · 1 answers · asked by izzie 4 in Chemistry

2007-04-30 15:44:58 · 19 answers · asked by Anonymous in Polls & Surveys

2007-04-30 15:44:50 · 41 answers · asked by Anonymous in Polls & Surveys

Hello!!! I have to present my science fair experiment tomorrow (a display board). And I am super-nervous as I always get bad grades on presentations.

Can you help me overcome this nervousness????

2007-04-30 15:44:47 · 8 answers · asked by Lala 3 in Psychology

I've been going out with the same guy for a year and 7 months now. He's really shy when it comes to us! we've haven't even kissed yet? Should I take a chance and try to kiss him?

2007-04-30 15:44:46 · 24 answers · asked by ~*~Babbii-gurl~*~ 1 in Singles & Dating

2007-04-30 15:44:40 · 34 answers · asked by Anonymous in Religion & Spirituality