Science & Mathematics - 18 August 2006

what's the application of Kirchhof's second law in real life.Give answer with example.

2006-08-18 08:10:59 · 7 answers · asked by star123 2 in Physics

100 people have been assigned seats for a lecture. There are exactly 100 seats in the room. However, the first person to enter the room has lost his seat assignment and randomly chooses a chair to sit in. The rest of the 99 people walk in one at a time and sit in their assigned seat if possible, or if someone is already in their seat they randomly choose one of the empty ones.

What is the probability that the last person to enter to room will sit in his assigned seat? And what is the answer if there are 1000 people and 1000 seats?

2006-08-18 08:07:56 · 12 answers · asked by Steven S 3 in Mathematics

Why coloumb's law(F=k q1q2/d^2) and newton's law of gravitation(F=G m1m2/d^2) is very similar to each other?

2006-08-18 08:06:47 · 4 answers · asked by star123 2 in Physics

A) Balance it, B) how many moles of O2 are produced and C)how many grams of H20 are formed.

If you could thoroughly explain how you got the answer I would appreciate it(have 19 more similar problems and a final on THursday[have everything else in chemistry downpacked]..I am completely lost)

2006-08-18 08:05:16 · 3 answers · asked by mcavey 2 in Chemistry

In my book it is written that:
[-1/r](where upper limit is r and lower limit is ∞]
then write,
[-1/r+1/∞]
But i don't understand how [-1/r+1/∞] comes ?any rule?
please explain me.

2006-08-18 08:01:09 · 1 answers · asked by star123 2 in Mathematics

2006-08-18 07:55:29 · 9 answers · asked by kayemethan 1 in Mathematics

This is strictly a what if question.

2006-08-18 07:53:35 · 8 answers · asked by afrprince77 2 in Astronomy & Space

Ok the thing I don't get about the gay is a choice argument is, let's see. Ok if they are straight starting off why would they have same-sex contact if they are not even attracted to the same-sex wouldnt it mean they have to be attracted to them because why would they just do it, to do it? Also when some are in danger are where it's really hard to be gay why would they choose that, someone fill me in. Because my gay cousin is and I don't know how I should react.

2006-08-18 07:53:23 · 9 answers · asked by dahamu_626 1 in Biology

How to find potential at a point in the Electric field due to a point charge?Give answer with explaination.

2006-08-18 07:52:52 · 6 answers · asked by star123 2 in Physics

or on both explain

2006-08-18 07:51:00 · 20 answers · asked by Anonymous in Astronomy & Space

Because the other day I was arguing with a friend, and I was sure that Mexico City is the world's most populated city,even though Tokyo appears in most of the World Atlas as the most populated city. We need to consider the fact that the last census that ocurred in Tokyo was in 2004 , while in Mexico City in 2000.

2006-08-18 07:46:10 · 17 answers · asked by berny 1 in Geography

a)1, 2, 3, 5, 16,_


b)1, 2, 3, 8,_, 224

2006-08-18 07:41:59 · 27 answers · asked by madan raj 1 in Mathematics

i'd be interested to hear a scientific explanation.

2006-08-18 07:41:13 · 6 answers · asked by Anonymous in Medicine

..to mislead people into wrong ideas about our origins, then are not the Bible, and all other phenomena similarly untrustworthy to creationists of that view ?

2006-08-18 07:38:57 · 17 answers · asked by GreatEnlightened One 3 in Biology

I mean like instant freeze. A person is standing in a room and the temperature can be instantly turned down to freeze the person immediately and kept at that same temp... let's say a year later, could you unthaw the person and have them come back to life? what about 100's of years later?

2006-08-18 07:26:23 · 15 answers · asked by Anonymous in Other - Science

Scientists have done great work because of which have learnt so much about the nature.

For a moment if we just try to forget about the all that has been discovered about the nature, share your thoughts about the following (what does your heart say?).

1. Do you think the nature will be as complex as described by quantum physics?

2. Lets say BigBang was not the cause of the universe, what else do you think could have caused the current universe?

3. Do you believe man will be able to find the "Grand unification theory"?

4. What could be the top 5 discoveries w.r.t physics say in the next 50 years?

2006-08-18 07:25:25 · 7 answers · asked by Anonymous in Physics

If you can get these all correct first I will give you 10 points!


True or False:
1. It is possible for diagonals of a quadrilateral to bisect each other without being a parallelogram.

2. It is possible for a quadrilateral to have perpendicular diagonals without being a rhombus.

3. It is possible for a quadrilateral to have one pair of opposite angles congruent without being a parallelogram.

4. A rhombus with congruent diagonals is a square.

5. A median of a trapezoid is perpendicular to the bases.

6. If the diagonals of a trapezoid are congruent, then the trapezoid is isosceles.

2006-08-18 07:25:21 · 8 answers · asked by Anonymous in Mathematics

I found out there is 575757 number combinations for 1-39 Is there a software program that will give me in all the numbers in a word spread sheet.

2006-08-18 07:23:50 · 4 answers · asked by TONY E 1 in Mathematics

If you can get all of these correct first I will give you 10 points! Thanks!


1. Calculate the slope between the points (3, 7) and (-3, 7).

a. 0
b. 1/6
c. 6
d. undefined

2. Calculate the slope between the points (-6, 9) and (4, 11).

a. - 1/5
b. 1/5
c. 5

3. If line MN is the diameter of a circle with M(-3, -4) and N(-7, -14), find the center of the circle.

a. (-2, -5)
b. (-4, -10)
c. (-5, -9)
d. (-10, -18)

4. Where P is (-2, 6), R is (-10, 4), and segment is a diameter of P, find the coordinates of T.

a. (-4, 12)
b. (6, 8)
c. (8, 2)
d. (8, 6)

2006-08-18 07:22:29 · 5 answers · asked by Anonymous in Mathematics

and if so can it be eaten?

2006-08-18 07:14:38 · 21 answers · asked by MARK S 1 in Biology

2006-08-18 07:05:43 · 4 answers · asked by RANADIP T 1 in Chemistry

2006-08-18 07:05:37 · 14 answers · asked by sadafour 1 in Astronomy & Space

I know a good bit about transformers from a theoretical perspective, but how are the windings made? What kind of insulation is used on the wire? How is the number of coils accurately counted? How are the taps accurately placed?

I guess this could apply to any wire winding as well, like in motors/generators.

Thanks!

2006-08-18 07:04:48 · 4 answers · asked by Ubi 5 in Engineering

I want to get into forensics but not sure what I should study such as chemistry or biology.

2006-08-18 07:03:14 · 4 answers · asked by Crunchies 4 1 in Chemistry

2006-08-18 07:01:52 · 14 answers · asked by Anonymous in Earth Sciences & Geology

2006-08-18 06:58:24 · 32 answers · asked by Anonymous in Mathematics

3, 7, 10, 8, _, 9, 12, 16.


1, _, 27, 256, 3125, 46656.

2006-08-18 06:52:40 · 17 answers · asked by madan raj 1 in Mathematics

Einstein couldn't grasp hold of the theory and I'm just wondering if it's more of a Las Vegas odds system than real science. Probability and uncertainty are good for horse races and roulette, but I find I need more from my physics. What if we just don't have the measurement tools at the quantum level to take into account the effects of the warping of time and space? At the macro level, these effects are small compared to the size of the objects, but at the quantum level, these effects could be astronomical to the point that we just can't measure them effectively to predict their outcome? Now, I'm not a mathetician and physics theorist so give it to me in something that I can get my arms around. And remember, simplicity is truth and complexity is mankinds way of saying, "I don't really know." Also, applying quantum rules to the universe? If we can't apply Relativity at the quantum level, why should the quantum level be applied at the macro level? String theory?

2006-08-18 06:51:15 · 6 answers · asked by Anonymous in Physics

I have a doubt:
a person who is a chemist, what is he: a person who have a drug story or a person who handle with chemistry?
chemistry is a course for drug store, or not?
what is a chemistry course?

2006-08-18 06:45:19 · 7 answers · asked by Anonymous in Chemistry

1. An art student uses strips of paper to form a quadrilateral with congruent diagonals. This quadrilateral must be a ____.

2. On a blueprint for a house, if the master bedroom is a parallelogram with at least one right angle, then the master bedroom will be the shape of a _____.

3. If a framer makes a quadrilateral frame out of four congruent boards, no matter how it is put together this frame will always be a _____.

4. A quadrilateral foundation with four congruent angles must be the shape of a ____.

The options are:

an isosceles trapezoid
a square
a rhombus
a parallelogram
a rectangle
no guaranteed classification
a trapezoid

If you can get the all correct first I will give you 10 points! Thanks!

2006-08-18 06:44:43 · 6 answers · asked by Anonymous in Mathematics