Science & Mathematics - 19 November 2007

A radar is tracking an object falling onto earth away from it, and three observations are successively recorded and given in
the following table:

[Horizontal distance (m) : 1 2 3 ]
[Vertical distance from earth : 1948 1860 1760 ]

Choosing the horizontal distance as input variable, use polynomial interpolation to estimate the horizontal disance of the object from the radar when it hits the ground.

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Now I would appreciate if you could tell me how I can do it?
I tried my textbook and I dont understand it, "find an equation that fits the data in the table" how? So please guide me through this question. Thanks

2007-11-19 12:32:16 · 3 answers · asked by Anonymous in Mathematics

you can use addition, subtraction, multiplication, and division, but you can only use each number once. must equal 24

2007-11-19 12:30:47 · 3 answers · asked by ashley 2 in Mathematics

When Lauren and Johnny worked together to rake the leaves in their backyard, it took them 6 hours. The last time the leaves needed raking, Johnny worked alone, and it took him 10 hours. If Lauren raked the leaves by herself, how long would it take her? (Only an algebraic solution will be accepted.)

2007-11-19 12:26:12 · 4 answers · asked by Anonymous in Mathematics

I wanted to know why India is one of the most populated countries. Please answer this question.

2007-11-19 12:25:49 · 15 answers · asked by aman351 2 in Geography

2007-11-19 12:25:41 · 4 answers · asked by Anonymous in Chemistry

A friend of mine told me that the fossils on display in museums are plaster replicas because the actual fossils are too fragile. I always thought that the fossilization process turned the bones into rocks. Who is right here?

2007-11-19 12:23:53 · 5 answers · asked by Ari 1 in Earth Sciences & Geology

What does it mean?

2007-11-19 12:21:48 · 4 answers · asked by Anonymous in Other - Alternative

how do i put these as a scientific notation...

1) 10,000
2) 0.0001
3) 10,000,000,000
4) 50,000
5) 2,000,000,000
6) 0.000.000 4
7) 0.0003
8) 790,000
9) 0.0175
10) 371
11) 0.00900
12) 0.62
13) 328 500
14) 76 450
15) 0.000 705

2007-11-19 12:19:45 · 4 answers · asked by Rosanna D 1 in Chemistry

^2 means to the 2nd power.
/ is the fraction devider like 1/10 is 1 over 10
sqrt is SquareRoot EX: sqrt -4 is The squareroot of -4

....................................................................................
Solve the quadratic equation by factoring.

1. 4x^2 - 25 = 0

2. -9x^2 + 12x - 4 = 0

3. 6 = x^2 - x
.......................................................................
Simplify the expression.

4. i + 3 + sqrt -4

5. (-5 - 8i) - (-4 - 8i)

6. 2+i/2-i (That's 2 + i over 2- i)
...........................................................................................................
Use the quadratic formula to solve the equation.

7. x^2 - 3x = -5

8. 2x^2 - 8x = -16

2007-11-19 12:19:26 · 10 answers · asked by net_phantom16 2 in Mathematics

express the number 25 as a prodcut of two complec conjugates, a + bi and a-bi in 2 different ways, with a and b being natural numbers?

2007-11-19 12:19:08 · 4 answers · asked by john c 1 in Mathematics

please help now and fast and soon

2007-11-19 12:19:07 · 2 answers · asked by Anonymous in Mathematics

2007-11-19 12:17:21 · 18 answers · asked by *im in such an adventure (life)* 1 in Weather

2007-11-19 12:16:03 · 1 answers · asked by Anonymous in Chemistry

Near the end of the track, there is a hemishperical hill (x) inches high. The ball rolls up the hill, down the other side, and crosses a finish line with a total travel time of t(1).

The experiment is repeated with all variables identical, except that the hemishperical hill is changed to a mirror image hemispherical valley with depth (x). The ball rolls out onto the flat section of track, through the depression, and crosses a finish line with a total travel time of t(2).

Neglect friction. Assume that the diameter of the ball is very small compared to the diameter of the hemispherical hill and valley (they travel the same total distance). Assume that the ball never leaves the track.

Which ball finishes first?

2007-11-19 12:14:33 · 2 answers · asked by J G 1 in Physics

2007-11-19 12:14:22 · 1 answers · asked by ace_ofgabriel 1 in Mathematics

2007-11-19 12:12:57 · 8 answers · asked by funnylady4u2 1 in Mathematics

Given that y-axis is a tangent to the circle with radius 5 units. If the cirlce passes through the point (1,-4), find the possible equation of the circle.

2007-11-19 12:12:43 · 1 answers · asked by Stormy Knight 1 in Mathematics

a) xylem : stomata
b) phloem : roots
c) lenticel : woody stems
d) vascular bundle : dermal tissue
e) pith : ground tissue

2007-11-19 12:10:09 · 1 answers · asked by Shakera L 1 in Biology

I have to take Statistics, and would like to become more familiar with my calculator. Thanks!

2007-11-19 12:09:43 · 4 answers · asked by Mike's Girl 3 in Mathematics

2007-11-19 12:06:44 · 9 answers · asked by susanna l 1 in Engineering

Ca(s) + Cu(NO3)2 --> ?
In Net ionic also.

My guess is Ca(s) + Cu^2- +2NO3^- --> Ca^2+ + 2NO3^- + Cu?
My question is with the product of copper. Is it Cu2 in a gaseous state or is it something different. This is my main concern if someone could explain this to me.

Also, if you want to do more here are the other ones.

These are the solutions I'm reacting the metals (Ca, Cu, Fe, Mg, Sn, & Zn) with:
1. Ca(NO3)2
2. Cu(NO3)2
3. FeSO4
4. Fe(NO3)3
5. Mg(NO3)2
6. SnCl4
7. Zn(NO3)2
I'm supposed to write the complete and Net ionic Eq. I can figure the Net ionic out if you help me with the complete.

From what I could tell, Cu, Sn had no reactions with any of them. Some of the other reactions didn't take place.

2007-11-19 12:06:12 · 1 answers · asked by Anonymous in Chemistry

I know they're too attract different living creatures to continue they're reproduction, but is that it?

ahhh, I need help!

2007-11-19 12:04:29 · 6 answers · asked by meghan♥ 4 in Biology

2007-11-19 12:04:05 · 9 answers · asked by Smiley6 1 in Mathematics

i just cant seem to get to grips with moles can someone walk me through this question

In a titration, 25cm3 of 0.01M potassium hydroxide is pipetted into a conical flask. Sulphuric acid is run in from the burette and it is found that 19.8 cm3 were required to react exactly. Calculate the concentration of a solution of sulphuric acid

H2SO4(aq) + 2HNO3(aq) to K2O(l) + CO2(g)

2007-11-19 12:01:58 · 6 answers · asked by Anonymous in Chemistry

Ok out of all of the questions I'm working on I have figured out all but these three they are giving me some trouble.



Question 1: Two identical brass balls mounted on wooden posts initially have different types of charge, +3uC and the other +15uC. The ball are allowed t touch and then are seperated again. What is the final charge on each ball?


Question 2: Two positive charges, each of magnitude 4 X 10 to the power of -6 C, are located a distance of 10cm from each other. What is the magnitude of the force exerted on each charge?


Question 3:An electron and a proton have charges of an equal magnitude but opposite sign of 1.6 x 10 to the power of -19 C. If the electron and a proton in a hydrogen atom are seperated by a distance of 5 x 10 to the power of -11 m, what are the magnitude and direction of the electrostatic force exerted on the electron by the protron?

2007-11-19 12:00:39 · 1 answers · asked by cassandra 2 in Physics

To dramatically show the difference between a million and a billion.
i.e. one million seconds equals 11 weeks. One billion seconds equals 33 years!!!

2007-11-19 12:00:24 · 3 answers · asked by DENNIS W 1 in Mathematics

as in single replacement, etc.
thanks!

2007-11-19 11:59:22 · 1 answers · asked by Anonymous in Chemistry

like dalton's theory and Bohrs theory and stuff like that

2007-11-19 11:59:19 · 1 answers · asked by Me 2 in Physics

2007-11-19 11:57:30 · 10 answers · asked by Levi 2 in Mathematics

2007-11-19 11:57:19 · 6 answers · asked by math 1 in Mathematics