Science & Mathematics - 2 October 2007

i live in illinois near st. louis and recently i went to a picnic and near some trees there were some massive spikey balls bigger than the sweet gum balls we usually see. and it has more spikes. when it was opened it has a nut but the covering on the inside is like velvet it was really cool looking and i would really like to know the name of it so i could learn more about them.

2007-10-02 06:54:01 · 4 answers · asked by bluecube05 3 in Botany

2007-10-02 06:53:09 · 5 answers · asked by leah a 1 in Mathematics

2007-10-02 06:53:00 · 9 answers · asked by sensual1_60419 1 in Physics

1. [(p'=>q)^p]=>q' = (p^q)'

2. (p<=>q)' = (p'<=>q)

Note: p^ doesn't mean p.p

2007-10-02 06:50:21 · 2 answers · asked by Irmak 7 in Mathematics

HCl+Fe->
HCl+MgO->
HCl+Al(HO)3->
?????????????

2007-10-02 06:50:16 · 3 answers · asked by THE BMW DUDE 1 in Chemistry

Such that the concentration of a phenolphthalein indication turns bright pink? Does this mean that the acid has been completely neutralized and that the concentration is zero? Or is there still some acid left in the mixture?

2007-10-02 06:43:28 · 3 answers · asked by blueanswers 2 in Chemistry

The Answer is 6-X^2. But I cannot find it for the life of me. Help?

2007-10-02 06:42:41 · 2 answers · asked by Master_Of_Socks 2 in Mathematics

Ammonia(aq) + hydrochloric acid(aq)


and identify the spectator ions

2007-10-02 06:40:35 · 1 answers · asked by bumblebee 4 in Chemistry

A block is projected up an inclined plane that makes and angle z to the horizontal. it returns to its intial postion with half its initial spped. what is the coeff of friction between the block and the plane in terms of the angle of incline?(hint: do any forces acting on the block change direction during its travels?)

this is what i got:
SUM OF Fx=Nx+wx+(Fk)x
= -mgsinz-Fk
=MAx
sum of fY=Ny+Wy+(Fk)y
= n-mgcos z
=MAy=0
max=-mgsinz-(miuk)(mgcosz)
miuk=(-Ax-sinzcosz)/gcosz
=(2ax-sin2z)/2gcosz

2007-10-02 06:40:30 · 1 answers · asked by berry 1 in Physics

2007-10-02 06:37:41 · 5 answers · asked by -Xx-green-xX- 1 in Physics

The initial velocity of a 1.90 kg block sliding down a frictionless inclined plane is found to be 1.10 m/s. Then 1.81 s later, it has a velocity of 7.13 m/s. What is the angle of the plane, with respect to the horizontal?

2007-10-02 06:36:08 · 3 answers · asked by jULIAN C 2 in Physics

Add examples.

2007-10-02 06:35:11 · 4 answers · asked by Anonymous in Physics

reactions. How is it used? please give exmples

2007-10-02 06:34:42 · 3 answers · asked by topher4193 2 in Chemistry

Or was it just matter and energy that was created or released?
If it wasnt created then is the black stuff of space what the universe is expanding into?

2007-10-02 06:32:43 · 8 answers · asked by futuretopgun101 5 in Astronomy & Space

2007-10-02 06:28:33 · 11 answers · asked by Anonymous in Mathematics

2007-10-02 06:27:01 · 3 answers · asked by jnester0289 1 in Chemistry

to a human eye would it cross the sky from a visible range going north to south in ... let's say ...7 seconds?
I'd tried searching for a picture of what it looks like from earth during the day to a naked human eye

2007-10-02 06:25:01 · 5 answers · asked by Anonymous in Astronomy & Space

Real Answerssssss plllzzz

2007-10-02 06:24:26 · 9 answers · asked by Anonymous in Astronomy & Space

If a reaction carried out at 25 degrees C has a rate constant of 3.15*10^-5 1/M*s and an activation energy of 36.6 kJ/mol, what is the temperature in degrees celcius when the rate constant is 4.80*10^-4 1/M*s?

2007-10-02 06:24:25 · 1 answers · asked by Anonymous in Chemistry

has any country secured rights for building stuff on the moon or mars or any other planets

2007-10-02 06:22:50 · 8 answers · asked by Frederick Hubbard 2 in Astronomy & Space

Real Answers plz

2007-10-02 06:20:10 · 8 answers · asked by Anonymous in Astronomy & Space

2007-10-02 06:19:28 · 3 answers · asked by Anonymous in Zoology

2007-10-02 06:16:50 · 13 answers · asked by dj 1 in Mathematics

A.Laid
B.Lie
C.Lay
D.Lain

2007-10-02 06:16:13 · 3 answers · asked by Anonymous in Zoology

2007-10-02 06:15:48 · 1 answers · asked by !Jeshyjellybean. 1 in Chemistry

2007-10-02 06:14:43 · 7 answers · asked by Q.xi 1 in Astronomy & Space

2007-10-02 06:10:12 · 11 answers · asked by Anonymous in Mathematics

2007-10-02 06:07:43 · 6 answers · asked by dj 1 in Mathematics

given a maximum voltage of 3.9491 volts and a minimum voltage of -0.0256 volts then what is half the max voltage value??

THESE ARE ON THE GRAPH AND THEN IT SAYS:
t0 = 1.241 sec
t1= 1.290 sec
t2 = 1.265 sec

THEN IT SAYS: Q7 shows on offest in the "zero" point. You must add the half quantity to the offset to find the scale's value for 1/2Max.

please help and explain thanks

2007-10-02 06:05:26 · 1 answers · asked by Anonymous in Physics

1) A flask contains 81.9 mL of 0.150 M Ca(OH)2. How many milliliters of 0.350 M Na2CO3 are required to react completely with the calcium hydroxide in the following reaction?
Na2CO3(aq) _ Ca(OH)2(aq) --> CaCO3(s) + 2NaOH(aq)

2) A 1.345 g sample of a compound of barium and oxygen was dissolved in hydrochloric acid to give a solution of barium ion, which was then precipitated with an excess of potassium chromate to give 2.012 g of barium chromate, BaCrO4. What is the formula of the compound?

2007-10-02 06:05:02 · 1 answers · asked by keya_na 2 in Chemistry