Science & Mathematics - 20 October 2007

first one to answer it correctly gets a prize =)

2007-10-20 04:08:55 · 2 answers · asked by Joseph 2 in Mathematics

1. find period of
a.sin(sin((5piex)/4))
b. 1/2((IsinxI)/(cosx) + (sinx)/ (IcosxI))
c. (IsinxI -IcosxI)/(I sinx+ cosxI)
2. find range of : a. y= 1/(sqrt(x-5))
b. y= 3/(2-x^2)

2007-10-20 04:05:24 · 1 answers · asked by Anonymous in Mathematics

(absolute value of 4x=1)=0.5

2007-10-20 03:58:24 · 6 answers · asked by za z 1 in Mathematics

f(x)=2cosx - |x|
on the interval (-pi,pi)
thank you :)

2007-10-20 03:50:26 · 4 answers · asked by ilovecoach 3 in Mathematics

my kids wading pool always has like 10 times as much rain as what the rain gauge said we got.

2007-10-20 03:49:54 · 5 answers · asked by Hey,geturjiblitzoffmyfacedude 2 in Weather

assuming that the current rate of hydrogen burning in the sun remains constant, what fraction of the sun's mass will be converted into helium over the next 5billion years?

2007-10-20 03:47:09 · 5 answers · asked by harisbahrudin 2 in Astronomy & Space

2007-10-20 03:46:23 · 3 answers · asked by sahurajesh29 1 in Geography

An easy-to-understand answer,please.

2007-10-20 03:45:49 · 2 answers · asked by saba 1 in Other - Science

I know that the formula is y''*h^2/2, where h is the distance between the interval. BUt what is the value of y''?

How do you determind the error bound of euler's method?

Help is needed, thanks.

2007-10-20 03:42:56 · 1 answers · asked by Anonymous in Mathematics

If a stone is thrown vertically upward from the surface of the moon with a velocity of 5 m/s, its height (in meters) after t seconds is h = 5t - 0.83t^2.
(a) What is the velocity of the stone after 1 s?
v = m/s

(b) What is the velocity of the stone after it has risen 5 m?
v = (smaller value)
v = (larger value)

2007-10-20 03:40:47 · 4 answers · asked by Anonymous in Mathematics

2007-10-20 03:40:23 · 5 answers · asked by kazbeth 2 in Earth Sciences & Geology

what is the approach through first principles?

2007-10-20 03:38:08 · 3 answers · asked by Anonymous in Mathematics

How can one correct this optical thing?

2007-10-20 03:37:35 · 3 answers · asked by Anonymous in Astronomy & Space

2007-10-20 03:37:32 · 1 answers · asked by Kenneth George Houdek 3 in Astronomy & Space

Arguments

P1 - The Universe is everything that is.
P2 - Everything that is cannot be smaller or larger than itself. Because everything is not realtive to anything.
P3 - Therefore the Universe could have never been infinitely small, nor can it be expanding.
Conclusion - Big bang theory is false

P1 - Things that grow larger, expand into something.
P2 - If the Universe is expanding - Then it must be expanding into something.
P3 - It cannot be expading into empty space - because space is part of the Universe. It cannot expand into nothing, because nothing does not exist.
Conclusion - The Big bang theory is false

P1 - Scientists say that time was created at the Big Bang. Therefore there is no "Before" the Big Bang.
P2 - Big Bang caused the Universe then it was casually realted to the Universe.
P3 - Casuality runs in both directions. Before an after.
P4 - Therefore if there is no before the big bang there can be no after the big bang.
Conclusion -Big Bang theory is false

2007-10-20 03:25:42 · 24 answers · asked by Future 5 in Astronomy & Space

And how do they know when to fly south?

2007-10-20 03:23:58 · 5 answers · asked by Anonymous in Zoology

I'm from Malaysia

Please say HI to me

I'll give you 2 points

I just can't believe that this question will be answered by people around the world

2007-10-20 03:21:56 · 11 answers · asked by yasmin g 2 in Geography

Hi to all

It's been a while since I have done maths!

How do you expand and simplify?

e.g. 2(3x+4) - 3(4x-5)

Is the answer 18x-15??

Or do you take away the x's instead of adding??

Thankyou

2007-10-20 03:18:05 · 13 answers · asked by Anonymous in Mathematics

Has Al Gore gone a wee bit over-board?

2007-10-20 03:09:24 · 6 answers · asked by Anonymous in Earth Sciences & Geology

2007-10-20 02:56:17 · 8 answers · asked by sai v 1 in Mathematics

( Coming in waves of Hydraulic pressure against mass )

In extreme weather on a ocean of liquid volume the hydraulic pressure coming in waves, against the haul of a ship can rip apart the greatest of ships in extreme weather conditions.The ocean floor design in the Burmuda triangle when the weather gets bad is contributer to this washer effect. ( Hydraulic pressure is one of the greatest energy forces on this planet.)

2007-10-20 02:44:40 · 3 answers · asked by Anonymous in Engineering

A rigid body is rotating counterclockwise about a fixed axis. Each of the following pairs of quantities represents an initiall angular position andd a final angular position of the rigid body. Which of the sets can occur only if the rigid body rotates through more than 180 degree?
a) 3 rad, 6 rad
b) -1 rad 1 rad
c) 1 rad 5 rad

** I think it is B, but I am not sure. Could someone please help me out and also show me how they got the answer.
THANK YOU

2007-10-20 02:43:01 · 6 answers · asked by markeesha h 1 in Physics

I know that it will absorb the nitrates but what about the rest of the stuff?

2007-10-20 02:38:18 · 8 answers · asked by mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm 1 in Botany

2007-10-20 02:33:27 · 5 answers · asked by Tracy 1 in Astronomy & Space

2007-10-20 02:29:37 · 10 answers · asked by Whats Up DOC 1 in Astronomy & Space

Which its nature.. It is of electromagnetic origin?

2007-10-20 02:27:10 · 4 answers · asked by Rossetto 4 in Physics

e.g. the film the great global warming swindle and also if you google global warming and solar system you will see the scientific evidence for warming on mars, pluto, jupiter etc the solar system is warming up and its SUN DRIVEN ...
else we have discovered mankind driving SUV's on other planets in this solar system ... is this GREEN TAX THING just a SCAM

2007-10-20 02:17:04 · 14 answers · asked by andrew NSE 3 in Astronomy & Space

We know the earth is for living planet and the sun is for the energy.
But what about other planets, I know it beautiful planets that God created and I need know what that other planets do for ?

2007-10-20 02:07:58 · 10 answers · asked by Anonymous in Astronomy & Space

What are good fields to enter into zoology??

2007-10-20 02:06:14 · 4 answers · asked by suzee 1 in Zoology

the problem is , simplify the following statement :

(p v r ) --> [ (q v (~r) ) --> ( (~p) --> r ) ]
what i did was , first the right hand side:
[ (q v (~r) ) --> ( p v r ) ] ( because ~p-->r is equivalent to p v r)
[ ~ (q v (~r) ) v ( p v r ) ] ( here i used the same logic rule)
[ (~ q ^ r ) v ( p v r ) ]
then
( p v r ) --> [ (~ q ^ r ) v ( p v r ) ]
then i used the equivalence p --> q == ~ p v q
in which p is ( p v r ) and q is [ (~ q ^ r ) v ( p v r ) ]
~ ( p v r ) v [ (~ q ^ r ) v ( p v r ) ]
(~p ^ ~ r ) v [ (~ q ^ r ) v ( p v r ) ]
then i get stuck in here :
(~p ^ ~ r ) v (~ q ^ r ) v ( p v r )
i cant use associativity law for r because i see different logic operators
what can i do ?

2007-10-20 01:52:44 · 3 answers · asked by Anonymous in Mathematics