Science & Mathematics - 12 November 2007

In an experiment, I got a non-zero intercept for a graph of applied force versus normal force. What could explain this?

Thanks in advance for help.

2007-11-12 10:39:03 · 1 answers · asked by Emmy L 1 in Physics

how would the graph of the following look like(since u cant exactly graph them here)
1. x=y^2+2 y^2 means y squared
2. x=y^2-2y
3. y=negative radical 4-x(this is underneath the radical and negative is outside

thanks!

2007-11-12 10:31:57 · 1 answers · asked by tennisgrl9294 3 in Mathematics

If raduis of round Earth is Re?

2007-11-12 10:31:34 · 3 answers · asked by Alexander 6 in Physics

2007-11-12 10:26:33 · 85 answers · asked by Anonymous in Other - Alternative

The element exists in nature as 2 isotopes.
^151Eu has a mass of 152.9209amu.
^153 Eu has a mass of 152.9209 amu.

The average atomic mass of europium is 151.96 amu.

Calculate the relative abundance of the europium isotopes.
pleaseee

give me the equation so i could understand

2007-11-12 10:26:28 · 4 answers · asked by Sina 2 in Chemistry

Find the derivative of f(x)=4√x using the definition of a derivative.

2007-11-12 10:26:02 · 8 answers · asked by oriolesfan2323 4 in Mathematics

Underline the reducing agent and draw a box around the oxidizing agent.


Br2(l)--> Br-(aq) + Br(O3)- (aq)

CN- (aq) + [Fe(CN6]3- (aq)--> OCN- (aq) + [Fe(CN)64- (aq)

thanks

2007-11-12 10:18:48 · 1 answers · asked by Anonymous in Chemistry

I'm simply stuck.


Problem:
A plane is flying horizontally 1 mile up at a speed of 500mph when it passes over a radar station.
Find the rate at which the distance from the plane to the station is increasing when the plane is 2 miles away from the station.

2007-11-12 10:17:35 · 1 answers · asked by Anonymous in Mathematics

Underline the reducing agent and draw a box around the oxidizing agent.

Hg(s) + (NO3)- (aq) + Cl-(aq) -->Hg(Cl4)2- (aq) + NO(g) +S(s)


I2(s) + S2(O3)2- (aq) --> I-(aq) +S4(O6)2- (aq)

thanks

2007-11-12 10:15:54 · 1 answers · asked by Anonymous in Chemistry

2007-11-12 10:15:08 · 4 answers · asked by mikegemmati 1 in Mathematics

what is the derivative of
3pieh - pieh^3

where h=height

thanks!!!

2007-11-12 10:14:31 · 2 answers · asked by Anonymous in Mathematics

A) move preferentially in directions perpendicular to the magnetic fields
B) move preferentially along magnetic field lines
C) move freely in all directions
D)cannot move at all
E) none of the above

2007-11-12 10:13:15 · 5 answers · asked by webb_ar 1 in Astronomy & Space

What should I divide or multiply by with -2=0y? I'm stuck once again :p

2007-11-12 10:09:41 · 6 answers · asked by Kitade 2 in Mathematics

what is 80% of 20?
what is 40% of 70?
16% of 125 is what number?
20 is 80% of what number
20% of what number is 48?
42 is 30% of what number?
50 is 25% of what number?

thank you very much if u do there

2007-11-12 10:08:49 · 8 answers · asked by Mikey j 1 in Mathematics

2007-11-12 10:06:36 · 18 answers · asked by Diane C 1 in Mathematics

Time spent using e-mail per session is normally distributed with mean of 8 minutes and standard deviation of 2 minutes. If you select a random sample of 25 sessions

a)What is the probability that the sample mean is between 7.8 and 8.2 minutes?
b)What is the probability that the sample mean is between 7.5 and 8 minutes
c)If you select a random sample of 100 sessions what is the probability that the sample mean is between 7.8 and 8.2 minutes

2007-11-12 10:05:14 · 1 answers · asked by Anonymous in Mathematics

2007-11-12 10:05:07 · 27 answers · asked by AlgebrahelpPLease!!! 1 in Mathematics

ok so heres a question that i hav wanted 2 kno the ansa 2 4 o so long...
2 really...
ok so...
(hav i sed that once already????)
1. if sumone went into space and they kept going further down and further down what the hell would they find or would it just keep going on forever and ever or will some kind of something happen???? (same question about if we kept going further up and up)
:D
2. if we went into a vortex or a black whole or whatever the hell they call it then what would happen??? would we just die or would soemthing happen 2 us and if so what????
i have asked all my teachers that but they just dont know what the answer is
nd they recentley found out that pluto was a dwarf palnet right?.?.?.
thx 4 all ya naswers
:D

2007-11-12 10:04:28 · 10 answers · asked by Anonymous in Astronomy & Space

mine are problems that deal with chickens. LOL! especially, the question like: "1 chicken and a half can lay 1 egg and a half in 1 and a half day." This is my favorite math question in the world.

2007-11-12 09:48:56 · 10 answers · asked by Anonymous in Mathematics

2007-11-12 09:48:51 · 8 answers · asked by Gruntled Employee 6 in Astronomy & Space

This has been buggin me alll day too..can you please help me out?

2007-11-12 09:48:37 · 6 answers · asked by Anonymous in Mathematics

The fastest pitch recorded in MLB is thrown by nolan ryan. If this pitch was thrown horizantally, the ball would fall .809 meters by the time it reached home plate 18.3 meters away. How fast was Ryans pitch? The number 809 has a point in front of it, and 18 POINT 3, thnx a bunch guys, 10 points to anyone who gets this right?????????

2007-11-12 09:48:12 · 1 answers · asked by braber5 1 in Physics

You have two lenses at your disposal, one with a focal length f1 = +31.9 cm, the other with a focal length f2 = -31.9 cm.

If you want to produce an image of the bulb that is enlarged by a factor of 3.00, how far from the wall should the lens be placed?
.............m

2007-11-12 09:47:48 · 1 answers · asked by ? 1 in Physics

I am trying to find the volume of a waste stockpile with the following characteristics. The top area is 35,189 units, the bottom is 698,886 units, and the angle of repose is 35 degrees. Help me out! Please provide any equations you used also.

2007-11-12 09:47:20 · 1 answers · asked by Brian 2 in Mathematics

I.e. is there anything in the past which was scientifically proven to be correct, which was subsequently found to have been incorrect?

2007-11-12 09:46:39 · 8 answers · asked by rebroad 2 in Other - Science

Solve for A: T=2A-5AB

2007-11-12 09:44:08 · 9 answers · asked by laxgirl 1 in Mathematics

I'm starting to get the hang of the substitution method, until this problem came to sight.... Where do I put 2x in the first equation?

3x-4y=10
y=2x

2007-11-12 09:43:35 · 4 answers · asked by WayCoo 1 in Mathematics

2007-11-12 09:43:26 · 1 answers · asked by logan_first 2 in Geography

1)A + (B + C) = (A + B) + C

2)5 + 7 = 7 + 5

3)4 + (-4) = 0

4) 5 * (3 * 2) = (5 * 3) * 2

5) 4(x - 3) = 4x - 12

2007-11-12 09:43:09 · 3 answers · asked by Anonymous in Mathematics

2007-11-12 09:42:52 · 1 answers · asked by damigurl05 1 in Biology