Science & Mathematics - 24 October 2007

All I know is that it is "annihilated".

2007-10-24 23:57:39 · 8 answers · asked by honourableone 3 in Physics

2007-10-24 23:45:09 · 35 answers · asked by Anonymous in Astronomy & Space

I forgot.

2007-10-24 23:21:40 · 14 answers · asked by Evoke 6 in Mathematics

I want to build something ambitious, like a 2 man submarine or a helicopter. I decided the submarine is too dangerous and the helicopter might chop my head off. Putting the technical details and restrictions aside, what should I make?

2007-10-24 22:53:40 · 6 answers · asked by worried person 1 in Engineering

2007-10-24 22:51:22 · 14 answers · asked by Anonymous in Astronomy & Space

I conducted an experiment, investigating how density affect a projectile with the presence of air resistance. (The object is launched horizontally from a height of 92cm)

Before the experiment, I researched and asked opinions from other people, all of which gave the same view---> greater density=greater distance. And this was the base of my hypothesis....

But the experiment turned out to be the exact opposite of my hypothesis. My results indicate that less density=higher distance. My average results are as follows:
(Objects have the same shape - 60cm^3 block)

1)Wood (density=0.467) - distance = 190cm
2)Wax (0.917) - 125cm
3)Aluminium (2.683) - 58cm
4)Iron (7.817) - 25cm

WHY is it like this? What's wrong? What seems to be the problem?

PLEASE help if you can... and try and explain cearly (my knowledge in physics is only sixth form level)

OH please i beg for your help and opinion..I'm mentally blocked right now, out of ideas... AND in need of some HELP

2007-10-24 22:40:10 · 8 answers · asked by max88 2 in Physics

2007-10-24 22:30:57 · 4 answers · asked by Anonymous in Astronomy & Space

I thought that when things bounced off other things they imparted more momentum (twice) then if they are just absorbed. since heating things is like imparting momentum to the molecules that make up the substance, and light does exert pressure, why is it that things that absorb light tend to heat up more than things that reflect it?

2007-10-24 22:24:29 · 5 answers · asked by keyahnoo 2 in Physics

2007-10-24 22:16:56 · 7 answers · asked by Justin H 7 in Biology

2007-10-24 22:15:10 · 6 answers · asked by janice 1 in Biology

Physics question. Here is scenario: 2 syringes filled with air; one a 10cc, the other a 30cc; plunger surface areas about 0.22 and 0.44sq inches respectively; syringes held back to back with plungers touching each other; I force the 10cc syringe against the 30cc syringe and measure STATIC pressures at the exit ports using digital manometers. Pressures are different. Why does Pasqal's law not apply? Example: 10cc syringe reads 20psi when the 30cc syring reading 20psi (air in 10cc syring appears considerably more compressed).

2007-10-24 22:00:06 · 2 answers · asked by Dr. Sully 1 in Physics

Find an expression in terms of n, for the nth term of the sequence 17, 14, 11, 8, 5, ...

The answer is 20 - 3n

I don't understand why there is a 20 and a 3 in the expression and why a minus sign is present..Could someone explain it to me so that I could resolve my doubts? Thanks!

2007-10-24 21:55:33 · 8 answers · asked by Anonymous in Mathematics

2007-10-24 21:54:44 · 9 answers · asked by jr1984 3 in Mathematics

2007-10-24 21:50:24 · 1 answers · asked by dird 2 in Mathematics

did they do anything else. it seems a long way to go and a lot of expence just for a few rocks.

2007-10-24 21:48:03 · 16 answers · asked by strongbow 3 in Astronomy & Space

We were having this discussion in school the other day. I read somewhere that yes it is a country, in fact it's the smallest country in the world. Most people said no it's not a country.

So yes or no?

2007-10-24 21:41:21 · 23 answers · asked by ★☆✿❀ 7 in Geography

Where?

2007-10-24 21:32:50 · 22 answers · asked by james l 1 in Geography

2007-10-24 21:19:51 · 2 answers · asked by ishika m 1 in Chemistry

2007-10-24 21:09:13 · 8 answers · asked by Anonymous in Medicine

2007-10-24 21:02:49 · 2 answers · asked by ishika m 1 in Chemistry

planets

2007-10-24 20:44:39 · 28 answers · asked by raman k 2 in Astronomy & Space

An boy throws a stone of mass 1kg. The stone is released with an initial velocity 5m/s
at an angle 30o above horizontal while it is at the height 1.28m. How far from the boy
will the stone land? What is the speed of the stone when it hits the ground? What is
the highest altitude the stone reaches?

2007-10-24 20:22:22 · 3 answers · asked by Dragon 1 in Physics

2007-10-24 20:22:06 · 20 answers · asked by Anonymous in Other - Alternative

2007-10-24 20:14:57 · 13 answers · asked by eddy f 1 in Astronomy & Space

2007-10-24 20:11:39 · 7 answers · asked by BARRY N 1 in Astronomy & Space

integrate (cos(x)+1)/x^5 from 10 to infinity
Can it be written as an elementary function?
If so, what is the elementry function?
My CAS can't figure it out.
I got the CAS for free...you get what you pay for.
Convergence is obvious but i am uncertain about it's indefinite integral.
I have the feeling as though it cannot be written as an elementary function.

Thanks

2007-10-24 19:58:56 · 4 answers · asked by philip32189 2 in Mathematics

here is a question
http://docs.google.com/Doc?id=dc83hzcs_212fgq97g

i tried to solve but it does not match with the answers given :(

2007-10-24 19:54:01 · 3 answers · asked by calculus 1 in Mathematics

1. Logb20 X
- B stands for base , so it reads Log with base 20 (x).
2.Y = ln (x^3+2x^2+4)
3.Y = ln[1+e^(x)/1-e^(x)]
4.Y = e^(x^(2+1)) * ln X (most difficult)

10 points for Best Helper

2007-10-24 19:42:01 · 2 answers · asked by Conservative Jesus 1 in Mathematics

P is the product of the digits and S the sum of the digits in N.If the natural number N is of the form XYZ where X is the number of hundreds, Y the number of tens and Z the units in N then
P= (X)*(Y)*(Z) ; S = (X)+(Y)+(Z). How many values N can take if 6P+4S=4N

2007-10-24 19:41:22 · 1 answers · asked by Venkat R 6 in Mathematics

a) on B from A?
b) on A from B?

2007-10-24 19:36:44 · 3 answers · asked by =P 6 in Physics