Science & Mathematics - 31 January 2007

2007-01-31 18:30:30 · 5 answers · asked by Anonymous in Mathematics

2007-01-31 18:26:23 · 5 answers · asked by ? 6 in Zoology

2007-01-31 18:26:12 · 7 answers · asked by Eva 1 in Botany

You are presented with 2 fuses (lengths of string) each of which will burn for exactly 1 minute, but not uniformly along its length. Can you use them to measure 45 seconds?

2007-01-31 18:21:15 · 5 answers · asked by Joanna U 1 in Mathematics

Me and you work at a shoe store. I dropped some boxes, spilling four different pairs of shoes. You picked up one shoes from the pile, and the nI picked up a shoe. What is the probability that the shoe I'm holding does not belong in the same box you are holding? (express as fraction)

How many faces does a trapezoid based prism have?

The odds of an event happening successfully are expressed as a:b, where a:b is the ratio of the probability of a successful event to the probability to and unsuccessful one? The odds of rolling a 5 on an unfair die are 1:3. What is the probability of rolling a 5 with this die? (express as percent)

Duringf a thunderstorm, I saw a flash of lightning and then six seconds later heard thunder. The speed of sound is 1088 ft/sec. How far am I from the lightning? (express to nearest thousand feet)

N has factors 15 and 10. WHat is the fewest total number of positive factors that N can have?

2007-01-31 18:19:40 · 2 answers · asked by cfishot 2 in Mathematics

2007-01-31 18:19:02 · 3 answers · asked by JRFM THIN 2 in Geography

Joan's compact disc player has a setting called"random" that plays the songs on a particular compact disc in any random order. If she is playing a compact disc with 7 songs, what is the probability that the order of the songs will be the exact same order as the order given on the compact disc(1-7)
well, this isn't written very easy to undersatand, does it mean the probability that the order of the songs will be exact same order as 1 to 7? or the probability of the arrangement of different orders? please explain its cannotation to me! in fact, is very bad writing in my opion.

2007-01-31 18:17:53 · 3 answers · asked by liangjizong22 1 in Mathematics

between an architect and a structural engineer?

2007-01-31 18:17:12 · 2 answers · asked by Anonymous in Other - Science

2007-01-31 18:15:36 · 6 answers · asked by rolfesangel 2 in Astronomy & Space

Question: a charge of q = +7.50 uC is located in an electrical field. The x and y components of the electric field are E(x) = 6.00 x 10^3 N/C and E(y) = 8.00 x 10^3 N/C, respectively. (a) What is the magnitude of the force on the charge? (b) Determine the angle that the force makes with the +x axis.

My Approach:
I have the answers to this problem; however, part (b) is where i am not getting the answer. I have theta = 53.13 degrees...my teacher marked it wrong for equalling 53 degrees. so what are his intentions? i asked him, but i cant understand his mumbling lol. anyways, i ask you people!

2007-01-31 18:13:40 · 3 answers · asked by Anonymous in Physics

I need help with this 5 part question that I have no idea how to solve.

Factors and Remainders
-------------------------------------
1. When x^3 + a is divided by x + 2, the remainder is known to be -15. Find the numerical value of "a".

2. Find the value of "a" above when x + 2 is replaced by x - 2.

3. Find the smallest value of "a" for which x^3 + a is exactly divisible by x+2

4. If x - a is a factor of x^2 + 2ax - 3, find the numerical value(s) of "a".

5. Find the remainder when x^6 + 1 is divided by x - m.
----------------------------------------------

Please help me, with explanations of how to do each step. Math has always been my weakest subject, and if possible, can anyone at least point me in the direction, and I'll do the calculating?

Thanks a lot,

Matt

2007-01-31 18:13:21 · 3 answers · asked by Matt B 1 in Mathematics

2007-01-31 18:12:53 · 10 answers · asked by Anonymous in Chemistry

You are dealt 5 cards out of a deck of 52.
a.) How likely is it to be dealt a hand with 4 Aces and the King of Hearts?
b.) Be dealt a hand with 4 Aces and a King?
c.) Be dealt a hand with 4 Aces?
I have the answers, but I need help with the solutions. No, this is not a graded hw assignment--it's for my own good!

2007-01-31 18:12:10 · 3 answers · asked by TomServo 3 in Mathematics

2007-01-31 18:10:27 · 7 answers · asked by ARBEN A 1 in Physics

2/3 ( 5y -1 ) = 1/2 ( 7y + 2 ) - 5
I have no clue what to do... i get to a certain point which i think may be wrong O_o''

2007-01-31 18:10:20 · 10 answers · asked by Anonymous in Mathematics

......over a period of time such as 30 days.....not long enough for them to die using a plant such as elodea....

2007-01-31 18:10:20 · 2 answers · asked by ElDarado05 2 in Biology

2007-01-31 18:06:27 · 9 answers · asked by Weston 2 in Mathematics

Question: a plate carries a charge of -3.0 uC, while a rod carries a charge of +2.0 uC. How many electrons must be transferred from the plate to the rod, so that both objects have the same charge?

My Approach:

N= q/e = -2.0e-6/-1.6e-19 = 1.25e13 electrons

What is the other part asking? does it include the -3.0 uC? That's where im stuck...my prof marked me wrong for having -2.0e-6 (without the units) - so am i technically right if i have the units attached to -2.0e-6 C? Thanks...

2007-01-31 18:04:51 · 3 answers · asked by Anonymous in Physics

2007-01-31 18:04:02 · 6 answers · asked by Anonymous in Mathematics

i think 2 is on the y axis and then the line goes up three and over one? am i right?

2007-01-31 18:03:55 · 3 answers · asked by =) 1 in Mathematics

I am planning a dinner meeting for 150 people. Each table will be set for nine people. If there are enough tables to accommdoate everyone, what is the fewest possible number of unused table settings?

I have enlarged a 3" by 5" picture so that both the length and width are tripled. By what number must the original area of the picture be multiplied to get the enlarged area.

A shake from Jake's Shakes uses 2 tsp vanilla, 2 scopps of ice cream, 4 oz fresh banana and 1/2 cup milk. A banana (without the peel) weighs 6 oz on average. How many whole bananas must Jake order so that he can make 500 shakes?

I roll three standard dice once. What is the probability that the sum of the numbers rolled will be three or more? Express as percent.

What is the smallest prime factor of 1821?

Three bags each contain the same number of marbles. (The weight of an empty bag would not affect the weight on the scale) If three bags of marbles plus two more marbles balance 14 marbles as shown, how?

2007-01-31 18:03:19 · 3 answers · asked by cfishot 2 in Mathematics

1. 5/6 ___ 9/11
2. 3/5 ___ 4/7
3. 35/51 ___ 12/17
4. 10/12 ___ 9/11
5. 15/32 ___ 1/2
6. 21/100 ___ 1/5
7. 8/9 ___ 19/21
8. 7/9 ___ 8/10

2007-01-31 18:00:15 · 4 answers · asked by Red 1 in Mathematics

2007-01-31 17:51:38 · 6 answers · asked by David S 1 in Earth Sciences & Geology

1. 1/4, 3/16
2. 5/6, 3/8
3. 3/5, 4/7
4. 2/9, 5/12
5. 5/11, 11/20
6. 1/2, 1/3, 2/5
7. 6c/5b, 7c/25b
8. 7/8a, 2/15a

2007-01-31 17:44:23 · 4 answers · asked by Red 1 in Mathematics

a. 20cm
b. 8 cm
c. 12 cm
d. 16 cm

2007-01-31 17:42:56 · 6 answers · asked by last3member2002 1 in Mathematics

2007-01-31 17:38:58 · 5 answers · asked by e. 2 in Mathematics

2007-01-31 17:33:07 · 1 answers · asked by foh_le 1 in Biology

I found one process by which I can get conc of ferrous sulfate heptahydrate but i dont know the source can anyone tell me about it in detail.
Process :Dissolve about 1 g of the sample, accurately weighed, in a mixture of 25 ml of 2 N sulfuric acid and 25 ml of recently boiled and cooled water. Add orthophenanthroline TS, and immediately titrate with 0.1 N ceric sulfate. Perform a blank determination, and make any necessary correction. Each ml of 0.1 N ceric sulfate is equivalent to 27.80 mg of FeSO4•7H2O.

2007-01-31 17:32:25 · 3 answers · asked by hamid 1 in Chemistry

I think it's half full, right?

Assume the container's walls have negligable mass.

2007-01-31 17:31:39 · 3 answers · asked by anonymous 4 in Physics

2007-01-31 17:28:22 · 3 answers · asked by Angelina 1 in Mathematics