Science & Mathematics - 2 September 2007

Sunrise:
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Sunset:
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Daytime:
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2007-09-02 11:21:55 · 6 answers · asked by ? 5 in Astronomy & Space

i want to know if its easy to get as raw metal form but if not what is .

2007-09-02 11:16:19 · 3 answers · asked by hangtenjeans 1 in Other - Science

A stone was thrown into air from a roof of a building 100fts. high with the speed of 20ft/s and 30 angle( from the ground level) while neglectin air resistance find:
a) the system of differential equation describing the motion of the stone thogether with the corresponding initial conditions,
b) the solution to the system in part a
c) stones highest altitude.
d) the time needed for the stone to reach the ground,
e) stone's position ( from the building) when it hits the ground,
stones velocity( its a vector!) and speed when it hits the ground
exact result
please can you show all the steps
thank you!

2007-09-02 11:15:42 · 1 answers · asked by cafet 1 in Mathematics

An archery enthusiast was testing his new bow. He shot an arrow straight up from the top of a building 48 feet high with an initial velocity of 32 feet per second. The height of the arrow (h measured in feet) after t seconds in flight is described by the equation
h = 48 + 32 t - 16 t**2.

Determine the number of seconds after the arrow is shot that it will strike the ground.

t = seconds

2007-09-02 11:13:29 · 5 answers · asked by lauren m 1 in Mathematics

the instructions say find values of x between 180 degrees and 270 degrees.

1.)if sin x = -15/17, find sec x...


2.)if csc x = -3/2 find cot x.....




now it says find values of x between 270 degrees and 360 degrees.

3.) if cos x= 3/10 find cot x



4.) if tan x = - 1/2, find sin x



thanks in advance! please explain how u get the answers!!

you dont have to do every single one, but do as many as u can please!

2007-09-02 11:08:36 · 1 answers · asked by Anonymous in Mathematics

mother nature isnt too happy with us... do you think the big one will happen soon?!

2007-09-02 11:08:06 · 10 answers · asked by shannonforpeace 2 in Weather

2007-09-02 11:07:03 · 3 answers · asked by Anonymous in Engineering

I don't have a scale, and I don't want weigh them in school(walking around with them all day).

2007-09-02 11:06:39 · 1 answers · asked by Anonymous in Biology

I can simplify expressions with powers if all you have to do is multiply, but I'm stuck on some more difficult problems. One of the problems I have to do is:

(x^2y)/(3y^3x^3) times (18x^4y^2)/(xy^6)

I'm not sure if you cross multiply or multiply regularly. Or if you have to simplify each side of the problem first?

Thanks!

2007-09-02 11:03:58 · 3 answers · asked by Anonymous in Mathematics

2007-09-02 10:57:52 · 4 answers · asked by Jeancommunicates 7 in Agriculture

the city that is located closest to 60 n (north latitude) and 150 e (east longitude)?

oh, and it's somewhere in russia.

2007-09-02 10:53:33 · 4 answers · asked by Anonymous in Geography

I know how to simplify square roots, but I don't know what rationalizing the denominator means. I have two problems that I'm stuck on:

1) 3√7/12
I'm supposed to simplify this, but I don't know how 7/12 can be simplified any more than it is.

2) √128 + √50
Neither of these square roots can be simplified, but if you add them, you get √178, which I don't think can be simplified either. So is there anything you can do to simplify this problem?

Thanks!

2007-09-02 10:53:29 · 9 answers · asked by Anonymous in Mathematics

a seven foot ladder, leaning agains a wall, touches the wall x feet above the ground. write an expression (in terms of x) for the distance from the foot of the ladder to the base of the wall.

i got f(x)=sqrt(x^2 +49)

is that right??



and i need clarification on a previously asked question....
simplify using only positive exponents. do not rationalize the denominator.

1. square root (4x-16) / fourth root {(x-4)^3}

2. [ (1 / x^-2) + (4 / x^-1 y^-1) + (1 / y^-2) ]^(-1/2)



sorry if its confusing (specially the second one...) let me know if you want clarification on any part of it!! thanks for the help!!!


please show steps...i think i have the right answer for 2, but im not sure... i got 1/x + 4/sqrtxy + 1/y




thanks soo much!!!

2007-09-02 10:51:35 · 6 answers · asked by Anonymous in Mathematics

1 Ignoring friction, what is the acceleration of the box? 2 What is the normal force exerted on the box by the ground?

2007-09-02 10:48:29 · 2 answers · asked by Pascal 4 in Physics

Lead Filings and Iron filings
Sand and Gravel
Sand and Fine Styrofoam
Alcohol and Water
Nitrogen and Oxygen

2007-09-02 10:47:56 · 5 answers · asked by INTOTEHasdffff 2 in Chemistry

1. x^2=square root of 50
2.x^2=square root of 4160

2007-09-02 10:46:58 · 2 answers · asked by Anonymous in Mathematics

I don't know how to write absoulute value on here. So I will just put an ! on both sides. The book says the answer is No Solution, Can someone explain why?
!7/2x+3! = -5

2007-09-02 10:42:52 · 7 answers · asked by calired67 4 in Mathematics

Please tell me the differential diagnosis. Thanks!

2007-09-02 10:41:41 · 8 answers · asked by Mulder 1 in Medicine

(sqrt18, sqrt12) , (sqrt8, sqrt27)

I know how to find the midpoint, but the square roots in this problem are throwing me off. The answer is already given in the back of my book so you don't need to work it out for me..just please explain what I should do with the squareroots.

2007-09-02 10:37:25 · 4 answers · asked by Nicky 2 in Mathematics

if I have -3x-squared)(-4x-squared) Would that make it 12x-squared or would it be not possible?

2007-09-02 10:34:49 · 6 answers · asked by RoXy 2 in Mathematics

Hello,

I am studying evolution right now, and wondering a little about it.

Did we evolve from other animals, or how did it work? And how long did it take humans to get here?

Can someone just give me a basic summary of how this all happened? I am confused about how it works!

2007-09-02 10:27:09 · 3 answers · asked by Jacques 3 in Biology

Verify that triangle PQR is a right triangle. P(3,2) , Q(-3,6) , R(5,5) You are supposed to use Distance Formulas and Pythagorean Theorem and I missed this class! HELP!

2007-09-02 10:26:18 · 3 answers · asked by Kitty 1 in Mathematics

2007-09-02 10:22:14 · 10 answers · asked by indie124 2 in Weather

2007-09-02 10:16:31 · 5 answers · asked by dennis g 1 in Medicine

the directions say- solve for values of x between 0 degrees and 90 degrees.

1.) sec x = 2 , find tan x

i got tan x= root 3... but how do i convert this to degrees, and am i even doing it right?

2.) cot x= 1/2. find sin x

i got 1/sin x = root5 / 2

again....degrees??

help pleasee!!!

2007-09-02 10:15:31 · 4 answers · asked by Anonymous in Mathematics

A teacher decides to scale her class's grades upwards. She raises the lowest score, a 47, to a 65. She raises the highest score, a 78, to a 90. What's the linear function that would fairly convert the other test scores?

I do know the answer to this problem, but what I don't know is how to get there. What steps should I take?

2007-09-02 10:13:30 · 1 answers · asked by Cosette 3 in Mathematics

(3a)^2b^-3
~~~~~~~~~
b^-2

thanks in advance! i tried everything and i still didn't get it!

2007-09-02 10:10:15 · 4 answers · asked by ggh 1 in Mathematics

2007-09-02 10:05:43 · 4 answers · asked by pink.princess1994 1 in Geography

The results of this experiment, and others like it suggested that light has "wavelike" tendencies.
I reference this experiment in a paper I just wrote.
Thanks

2007-09-02 10:03:34 · 3 answers · asked by Michael P 1 in Physics

Simplify: |√(7)-7| - |-5|

I have the answer [-√(7) + 2] but must understand how to get the answer, please help!

Thanx a bunch!

2007-09-02 09:57:40 · 1 answers · asked by Anonymous in Mathematics