Science & Mathematics - 19 August 2006

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.

2006-08-19 03:34:33 · 5 answers · asked by star123 2 in Mathematics

2006-08-19 03:28:07 · 17 answers · asked by monstermania_06 1 in Zoology

In a activity to test the temperature of water freezing to ice must added salt.Teacher says salt were decrease the temperature.But how it decrease the temperature of a liquid?

2006-08-19 03:26:34 · 6 answers · asked by kerk 1 in Chemistry

2006-08-19 03:26:04 · 28 answers · asked by Anonymous in Geography

My cat always cleans herself. No matter what. What is the reasoning behind this. I cant think of any other animals that do this all the time. And do big cats (lions, tigers) do this as well?

2006-08-19 03:25:57 · 19 answers · asked by R Squared 3 in Zoology

2006-08-19 03:23:20 · 3 answers · asked by TJ 1 in Zoology

Does an electrical and electronics engineer fit into a computer based job??????

2006-08-19 03:21:21 · 9 answers · asked by SilentKiller 3 in Engineering

venus actually has a thick atmosphere and active volcanoes..............is it possible that venus was a former comet that passed closed to earth?

2006-08-19 03:20:25 · 20 answers · asked by Anonymous in Astronomy & Space

The human speices lifestyle is influened by biology i.e the study of living things in many ways. What impact has biology had to us?

2006-08-19 03:18:24 · 4 answers · asked by Lu S 1 in Biology

2006-08-19 03:16:30 · 7 answers · asked by jay 1 in Physics

2006-08-19 03:16:01 · 12 answers · asked by notthesharpone 2 in Other - Science

Find the smallest natural number n which has the following properties:

a) Its decimal representation has six as the last digit.
b) If the last digit 6 is erased and placed in the front of the remaining digits, the resulting number is 4 times as large as the original number n.

2006-08-19 03:14:52 · 20 answers · asked by Anonymous in Mathematics

Please answer it faster because its a project..

2006-08-19 03:12:37 · 6 answers · asked by goddard 1 in Engineering

2006-08-19 03:08:28 · 21 answers · asked by Anonymous in Physics

2006-08-19 03:04:35 · 8 answers · asked by goring 6 in Physics

And why or why not?

2006-08-19 03:03:46 · 14 answers · asked by Anonymous in Zoology

2006-08-19 03:02:06 · 12 answers · asked by ? 4 in Geography

2006-08-19 02:55:09 · 7 answers · asked by jay 1 in Physics

When pilots say we are "250,000 metres above sea level" what does that mean? Is it from the take off ground to where ever the plane is in the air/sky measures 250,000 metres? or what?

2006-08-19 02:55:00 · 23 answers · asked by myname 1 in Physics

2006-08-19 02:53:23 · 6 answers · asked by nwenkiteh a 1 in Biology

Today teacher is teaching about pH.pH is means the power of acid and alkali.I ask the teacher why the p must be small letter and H must be capital letter.My teacher don't know the answer.So have someone help to solve the question.

2006-08-19 02:50:13 · 10 answers · asked by kerk 1 in Chemistry

Anyone point me where to find help in building a electric generator, only something to charge a battery to light a bulb?
I have an old electric drill, maybe run it bacwords?

2006-08-19 02:47:11 · 11 answers · asked by pj2024 3 in Physics

Now a days i feel days are passing very soon... why is it so... and It may looks silly.. .now a days, is there 24hrs per day?

2006-08-19 02:47:06 · 11 answers · asked by Rock 1 in Physics

2006-08-19 02:44:41 · 31 answers · asked by Anonymous in Biology

Something that heavy needs a large pressure difference above and below its wings for support. Even railroad locomotives riding on steel rails are not that heavy. How is this accomplished? Can the Bernoulli Effect or Venturi Effect create a near perfect vacuum or even a half perfect vacuum above the wings? Is there a formula that provides the lift force? If not, why not? Does this formula apply to wind turbines to provide the blade driving force as well?

2006-08-19 02:42:57 · 10 answers · asked by hrdwarehobbyist 2 in Engineering

2006-08-19 02:41:44 · 10 answers · asked by Anonymous in Other - Science

can someone give me a good, detailed definition?

2006-08-19 02:41:27 · 6 answers · asked by Anonymous in Physics

2006-08-19 02:35:27 · 21 answers · asked by Anonymous in Biology

2006-08-19 02:34:30 · 18 answers · asked by bigal363@verizon.net 1 in Chemistry

2006-08-19 02:31:18 · 11 answers · asked by John 1 in Chemistry