Science & Mathematics - 8 July 2007

of 30 amperes flows through a system with 16 ohms resistance and electromotive force of 120 volts, find the current that a 200-volt electromotive force will send through the system. thankss.

2007-07-08 23:51:09 · 4 answers · asked by Ocean Princess 1 in Physics

Any benefits to our environment of having man-made materials such as plastics???

2007-07-08 23:48:57 · 2 answers · asked by Anonymous in Biology

would the base elements that were ejected in to space travel at a uniform speed and to a uniform distance or would heavier elements travel further or less. If this were so would it be correct to say that given as we dont know were we were in relation to the center, that our galaxy and the other local galaxies could possably be made up of differant elements to those Galaxies in far, far away space ( deep field galaxies ) and if so could these elements have different properties and reactions to earth elements and could disprove OUR basic understanding of astro-physics and einstiens theories.

2007-07-08 23:47:52 · 8 answers · asked by Matthew 3 in Astronomy & Space

For e.g. if sun sets at 7 pm, the darkness starts spreading immediately. Do both the phenomena occur at exactly the same time or there is any difference of 2, 5,10 or 15 minutes between both. Or in other words if one says, "we will meet at the time when the sets in the west and the darkness rises from the east" what time (or time span) will this sentence reveal

2007-07-08 23:35:46 · 3 answers · asked by sohailzhaider 1 in Weather

Where do you think space ends and what is it like?

2007-07-08 23:26:16 · 11 answers · asked by loopy d loop 2 in Astronomy & Space

2007-07-08 23:24:37 · 18 answers · asked by DeepNight 5 in Astronomy & Space

This is a serious question.
Obviously the heart stopping and breathing stopping are quite significant indicators, but there are cases where both these occur but the person still recovers maybe 10 minutes later .

Ultimately does science yet have a hard and fast measure as to when death has occured or is it down to the subjective but informed judgement of the doctor?

2007-07-08 23:24:08 · 8 answers · asked by ? 2 in Biology

2007-07-08 23:21:21 · 14 answers · asked by Anonymous in Astronomy & Space

my boyfriend has just recently started a new job and is strugling to work out the required amount of materials needed to fill holes for example he dug a hole so deep and wide and he couldnt work out how much material to order to fill it could someone please tell us if there is a graph or tool that works it out for you. thanks

2007-07-08 23:15:30 · 16 answers · asked by ljg 1 in Engineering

2007-07-08 23:14:38 · 13 answers · asked by Anonymous in Astronomy & Space

2007-07-08 22:57:32 · 1 answers · asked by ARNEL S 1 in Engineering

PROVE:

3 + 7 + 11 +.... +(4n - 1) = n(4n - 1)

2007-07-08 22:51:17 · 10 answers · asked by Ed G 2 in Mathematics

i said in the ionic equation all the 8h2o ions r only from mno4 but whne we see in the molecular equations it seem that 3 h2o molecules r from mno4 and 5 molecules r from 5h2so4 this u can solve if or take it
usman_qureshi22@yahoo.com

2007-07-08 22:47:47 · 1 answers · asked by Anonymous in Chemistry

analytical balance weighs mass right? but can someone use it while in orbit where there is no gravity and everything is floating?

2007-07-08 22:41:54 · 6 answers · asked by Matthew 2 in Astronomy & Space

question: The radius of a cylinder is increased by 15% and its height is decreased by 20%. Find the percentage change in the volume of the cylinder.

answer: ?????

2007-07-08 22:35:19 · 5 answers · asked by sguy 1 in Mathematics

Are they the same thing or different?
What are examples of each?

2007-07-08 22:31:10 · 12 answers · asked by acendedindividual 3 in Other - Science

..cont..
At the same instant, a car with a speed of 1.5m/s & 10m away from the intersection (perpendicular to the railway), is in a hurry to beat the warning signal. If the car kept a constant acceleration of 0.25m/s^2, is it possible for the car to pass through the intersection without colliding w/ the train?..

2.) The motion of the truck is given by the equation: v=dt+ct^2, where d=50cm/s^2 & c= -5cm/s^3. Determine the..
(a) average acceleration from t=1.5s to t=5.0s
(b) instantaneous acceleration when t=3.0s

3.) the motion of a particle is described by the equation:
x=ct^2+b, where c=10cm/s^2, & b=5cm. Determine the instantaneous velocity when t=1.75s.

I really need your help guys..pls...
it's very important and urgent..
lots of thanks in advance..(^_^)

2007-07-08 22:14:08 · 3 answers · asked by eM-eM 1 in Physics

first problem is this that in the molecular equation in the right hand side mn(2+) is joined with someother like mnso4 there fore u wrote it alone also what r spectators elements .Also in the molecular equation
kmno4+h2so4=>k2so4+mnso4+3h20 +5(o)
feso4+h2so4+5(o)=> fe2(so4)3+5h2o
main problem is this that in the ionic eqation (the top most) there r 8 h2o and seems that all r from mno4 which produces when 16H joined with o4 of mno4 so how in other molecular eqyations it is 3h2o then 5h2o although when u add it becomes 8h20. the problem is this that first equation shows that all h2o r from mno4 but the two molecular equations show that water is also from mno4 and also from h2so4 thanks

2007-07-08 22:03:49 · 6 answers · asked by Anonymous in Chemistry

Is there a way to differentiate a pure Copper item from that of a Copper Alloy just by simple means? e.g. weight or density?
as in don't need all those complex lab experiments and apparatus?

thank you. =)

2007-07-08 22:02:54 · 2 answers · asked by c00ki3m0n5tr 1 in Physics

2007-07-08 21:57:40 · 11 answers · asked by Anonymous in Astronomy & Space

I am still very confused. Let's say the mass of a moving object, speed, and everything else remains unchanged. The only difference being the circumference.

Lets say the circumference is 1m and has 2.5m/s velocity. If everything else is unchanged, except that i increase the circumference to 2m. Will the velocity increase twofold to 5m/s and is this practical?

2007-07-08 21:54:58 · 5 answers · asked by Vienna 3 in Physics

Ok, the answers I keep getting don't match what is in the back of the book, even though I've gotten all the previous questions in the book right. So obviously, one of us is wrong (probably me), so I want you guys to tell me what the answers are. Here is the question:

"Solve the following simultaneous equations using the substitution method:"

3x + 2y = 33
y = 41 - 5x

So basically, using the substitution method, I need to find the values of the variables. Can anyone tell me the answers?

2007-07-08 21:42:44 · 12 answers · asked by Anonymous in Mathematics

2007-07-08 21:33:34 · 11 answers · asked by Sivaraj AP 1 in Biology

I know the brushed are less magnetic interfered, higher efficient, etc. But, how the DC and the AC of the brushed
type different? Sincerely.

2007-07-08 21:18:32 · 2 answers · asked by volvo942 1 in Engineering

the radius to the outside edge of a circular path is 12 feet greater than the radius to the inside edge. of the folliwing, which is the closest approzimation to the positive difference, in feet, between the circumferences of the two edges of the path.

a 12
b 15
c 25
d 37
e 75

2007-07-08 21:00:49 · 11 answers · asked by [Music = love] <3 2 in Mathematics

introduction , chapterwise results

2007-07-08 20:58:13 · 2 answers · asked by Anonymous in Geography

2007-07-08 20:57:29 · 27 answers · asked by zakri 1 in Astronomy & Space

I am confused whether the order of a given graph G is just the same as the total number of vertices in a graph.
- Graph Theory

2007-07-08 20:54:57 · 2 answers · asked by Rhea Y 1 in Mathematics

I have 450g of salt and flour mix. How many grams of flour should I add to reduce the percentage of salt in the mixture to 90% of what it was?
The answers are:
a) 50 b) 10 c) 30 d) 45 e) 60
Please answer "why" not just how as I am preparing for an exam and need to know how to do it in the future.
Thankyou for your help!

2007-07-08 20:53:43 · 8 answers · asked by checked.cherry 2 in Mathematics

what would happen to the world?

2007-07-08 20:50:16 · 11 answers · asked by mizzmamma 5 in Earth Sciences & Geology