Science & Mathematics - 14 September 2007

2007-09-14 18:13:33 · 9 answers · asked by Anonymous in Mathematics

All help will be much appreciated!!! but please dumb it down for me :) Thanks!!!

2007-09-14 18:13:10 · 4 answers · asked by Anonymous in Chemistry

If a wire is hooked up to an Electro Motive Force (EMF) and produces a magnetic field, would it produce the same magnetic field strength if another identical wire was hooked up to the EMF in parralell? Or would the magnetic field be stronger or weaker?

2007-09-14 18:10:24 · 3 answers · asked by Anonymous in Physics

since its supposedly going to pass by earth or somthing like that in 12/21/2012 and is suppose to pretty much kill 90% of the ppl on earth then why arent people making a big deal out of it why isnt NASA warning us?? is it really going to happen or not?? ive watched videos on youtube and they have me convinced now im shitting bricks lol ...whats your take on this?

2007-09-14 18:08:58 · 7 answers · asked by Anonymous in Astronomy & Space

(14.3(+and- 0.2)-11.6(+ and - 0.2) X 0.050 (+ and - 0.001)/ (820 (+ and - 10) + 1030 (+ and - 5)) X 42.3 (+ and - 0.4) = 1.725 (+ and - ?) X 10-6"

2007-09-14 18:04:59 · 2 answers · asked by scorrea54 1 in Chemistry

two barrels of wine were analyzed for their alcohol content in order to determine whether they were from different sources. one the basis of 6 analyses, the average content of the 1st barrelwas established to be 12.61% ethanol. 4 analysis of the 2nd barell gave a mean of 12.53% alcohol. Together the ten analysis yeilded a pooled value of s+0.070%. Do the data indicate a difference between the wines at the 95% confidence level?

values of t for various levels of probability:
deg of freedom: 3 4 5 6
95% 3.18 2.78 2.57 2.45

2007-09-14 18:03:50 · 1 answers · asked by scorrea54 1 in Chemistry

Needs to solved in terms of ln, natural log

2007-09-14 18:03:00 · 4 answers · asked by Kelli J 2 in Mathematics

2007-09-14 17:58:10 · 5 answers · asked by xurnis_001 1 in Biology

The mass of a piece of iron is 1.62 g. If the iron is exposed to oxygen under conditions in which oxygen combines with all of the iron to form pure oxide of iron, the final mass increased to 2.31 g.
Find the empirical formula.

2007-09-14 17:57:17 · 2 answers · asked by gurlygal 1 in Chemistry

math whiz

2007-09-14 17:49:16 · 19 answers · asked by football player 3 in Mathematics

3. The germination rate for zinnia seeds is 78%. This means that, on average, 78% or the seeds will sprout and grow into plants.

Q: What is the independent variable? What is the dependent variable?
A: independent: germination rate
Dependent: seeds

Q: Express this relationship as a function.
A: f(x) = .78x

Q: What is the domain of this function? What is the range?
A: x is greater then or equal to zero
Y is greater then or equal to zero
Q: If Jim wants 60 plants for his yard, how many seeds should he plant?
A: x = 77

4. It costs $25 a day plus $.06 per mile to rent a car.
Q: What is the independent variable? What is the dependent variable?
A: independent: days
Dependent: cost

Q: Express this relationship as an equation.
A: f(x) = 25x + .06

Q: What is the domain of this function? What is the range?
A: x is greater then or equal to zero.
Y is greater then or equal to .06

Q: What is the greatest number of miles you can drive in a day if you have $40
A: x = 1.5976

2007-09-14 17:45:22 · 2 answers · asked by Ryoma Echizen 3 in Mathematics

convert 20kg to grams

convert 400mL to L

convert 12m to cm

convert 3.5 hours to seconds

also,

put 0.000,0067 kg to a scientific notation

2007-09-14 17:43:12 · 5 answers · asked by ALESANA 7 in Chemistry

yeah I'm a noob to electronics...does it work to attach a capacitor to a battery to a switch...so when you flip the switch on it'll charge the capacitor? bonus! could i attach two wires to the capacitor so when it's charged i touch those wires on something conductive and it will spark?

2007-09-14 17:42:01 · 2 answers · asked by tatsumasax 2 in Engineering

3/4 - 2/3 > -x/6 ( both the numerator and denomentator are negative.)

2007-09-14 17:40:57 · 3 answers · asked by Anonymous in Mathematics

Just a stupid question I asked b/c i'm bored as anything!

2007-09-14 17:33:47 · 2 answers · asked by Anonymous in Other - Science

2007-09-14 17:32:44 · 2 answers · asked by Gemma S 1 in Astronomy & Space

1. The sum of the digits of a two digit number is 14. if the digits are received, the number is increased by 18. What is the number?

2. One number is 4 less than another number. The sum of the numbers is four times their difference. What are the two numbers?

3. How many kilograms of pure silver must be added to a 60% silver alloy to obtain 8 kilograms of a 57% silver alloy?

4. How many liters of a 35% acid solution should be mixed with a 14% acid solution to obtain 70 liters of a 20% acid solution?

5. Mr. Santos purchased 10,000 worth of stocks. One stock pays dividends at the rate of 4% per year. The other stock pays 6% per year. If Mr. Santos’ yearly income from the dividend is 500, how much of each stock does he own?

6. Cashing a check of 4000, Mrs. Cruz asked for the whole amount in 50 and 100 bills. She received a total of 53 bills. How many of each bill did she receive?

2007-09-14 17:32:08 · 4 answers · asked by Ruth Naomi Mariae R 2 in Mathematics

This has been stumping me.

When a camera flash goes off, the batteries immediately begin to recharge the flash's capacitor, which stores electric charge given by the following. (The maximum charge capacity is M and t is measured in seconds.)
Q(t) = M(1 - e^(-t/a) )

2007-09-14 17:26:01 · 2 answers · asked by ILuvTaraReid 2 in Mathematics

2007-09-14 17:22:48 · 5 answers · asked by Anonymous in Chemistry

I'm currently in a Chemistry class, and one of the things we've learned is rounding numbers to the correct numbers of significant figures. It's easy stuff, so it's not troubling me, but I've just been wondering what the point is in rounding to significant figures. Is there any practical use for it, or did some scientist or whatever one day decide we should do that?

2007-09-14 17:22:16 · 5 answers · asked by chucknorris=theman 2 in Mathematics

how to solve this

2007-09-14 17:18:57 · 6 answers · asked by Anonymous in Mathematics

2007-09-14 17:09:14 · 6 answers · asked by dabo 1 in Biology

2007-09-14 17:07:26 · 4 answers · asked by Anonymous in Chemistry

567=7/3q

480=3/7q

164=4/5q

2007-09-14 17:07:04 · 9 answers · asked by finitemathkid 1 in Mathematics

a) 9.00
b) 5.00
c) > 9.00
d) < 5.00

2007-09-14 17:05:57 · 2 answers · asked by Tonnie 1 in Chemistry

the greatest height reported for a jump into an airbag is 99.4 m. Dan Koko jumped from a Vegas hotel and struck the airbag with a speed of 39 m/s. To assess the effects of air resitance determine how fast he would have been traveling on impact if air resistance had been absent.

2007-09-14 17:01:34 · 4 answers · asked by smarin1987 2 in Physics

From a certain point, the angle of elevation to the top of a church steeple is 10 degrees. At a point 100 m closer to the steeple, the angle of elevation is 20 degrees. Calculate the height of the church.

the answer i got (from using the sin/cos laws) was 34.21 m. can anyone confirm this for me? though my answer probably is wrong anyway . . .

thank you very much!

2007-09-14 16:53:14 · 11 answers · asked by Anonymous in Mathematics

2007-09-14 16:46:03 · 14 answers · asked by yaldaz k 1 in Biology

I know my spelling is off and i am asking for help. Potasium magnite and Glyceride.

2007-09-14 16:43:07 · 5 answers · asked by naturally323 1 in Medicine

does science leave any room for religion now that its discovered theories of relativity, superstring theory, BIG BANG THEORY!, wormholes, blackholes, stars, etc..... why have religioin anymore? everything has chance not luck. everything has reason not a supernatural "thing" controling it. Matter is not created by "god" it is eternal. What is the use of religion when it is so unaccurate to the creation of the universe???

2007-09-14 16:38:02 · 15 answers · asked by Allen 2 in Physics