Science & Mathematics - 18 October 2007

2007-10-18 12:15:12 · 5 answers · asked by Anonymous in Geography

multiplying -12 by -97 produces the same result as multiplying 97- by 12-. What property is this??

2007-10-18 12:13:52 · 8 answers · asked by Anonymous in Mathematics

What county is Normal, Illinois or Bloomington, Illinois in?

Example: Springfield, Illinois is located in Sangamon county.

2007-10-18 12:13:45 · 3 answers · asked by Anonymous in Geography

Hi well what i don't get about Oxyacids are these questions lol

Hydrogen Sulphate gets H2SO4
Sulphuric Acid get H3SO4
(Why does sulphuric acid give Hydrogen a 3 then a 2?
like this question
Phosphorous Acid
Hydrogen Phosphite gets H3PO3 (aq)

Why does it get a 3 instead of just leaving it blank> I don't understand that concept lol

2007-10-18 12:13:43 · 3 answers · asked by PinK_sugar23 2 in Chemistry

A projectile is shot from the edge of a cliff h = 205 m above ground level with an initial speed of v0 = 115 m/s at an angle of 37.0° with the horizontal

(a) Determine the time taken by the projectile to hit point P at ground level.
s
(b) Determine the range X of the projectile as measured from the base of the cliff.
km
(c) At the instant just before the projectile hits the ground, find the horizontal and the vertical components of its velocity. (Take up and to the right as positive directions.) horizontal m/s
vertical m/s
(d) What is the the magnitude of the velocity?
m/s
(e) What is the angle made by the velocity vector with the horizontal?
° (below the horizontal)
(f) Find the maximum height above the cliff top reached by the projectile.
m

2007-10-18 12:12:47 · 2 answers · asked by kdcheerldr 1 in Physics

Can someone help me with this problem we have for homework?

Explain a procedure to find the % of salt in a sand/salt mixture.

Any ideas, my best best so far is telling my teacher to count the grains of salt herself. hahah thanks

2007-10-18 12:12:15 · 2 answers · asked by Anonymous in Chemistry

2007-10-18 12:09:59 · 2 answers · asked by soccerchika78 1 in Biology

Well, for my multivariate calculus math homework, I have to do the proof of this:
lim x->a (u(x)∙v(x)) = lim x->a (u(x)) ∙ lim x->a (v(x))

I have to use the epsilon-delta way to prove it and have no clue where to start.

2007-10-18 12:09:24 · 2 answers · asked by jthereliable 3 in Mathematics

i don't know this one at all

2007-10-18 12:08:27 · 3 answers · asked by Anonymous in Geography

1. What is the longest mountain range in the United States.
2. Are there more mountains east or west of the Mississippi River?

2007-10-18 12:08:10 · 4 answers · asked by Anonymous in Geography

HELPPPPPPP TRICKY QUESTION!!! please

Buck and Henry bought three horeses of equal value $840. Buck contributed $450 and Henry conributed $390. By the end if the day, they had sold one horse $840 and decided to end their partnership. How should they divide the money fairly if Henry keeps the two horses? Explain.

2007-10-18 12:07:51 · 7 answers · asked by lovely l 1 in Mathematics

why is it vandium III sulfate

I thought was just vandium sulfate, how do i know when i need to take into account when to write those subscripts in ?

2007-10-18 12:07:29 · 3 answers · asked by Anonymous in Chemistry

There is a tornado warning right now. I live on the 2nd floor of an apartment building. There is a basment floor below the 1st floor.
Where do we take shelter. In my windowless bathroom or downstairs in the basement floor hallway?

2007-10-18 12:05:42 · 7 answers · asked by entyce68 2 in Weather

A right triangle has an opposite =3 and an adjacent =5
1.Compute the hypotenuse
2.Compute sin theta
3.Compute theta

2007-10-18 12:05:05 · 3 answers · asked by lub1210 1 in Physics

i no this but i am no genius not a nerd........i am just smart (LOL) ....anyuwayssssshere is my question a small cube has 2 cm lenghth,4 cm wide, 0,5 cm height,and it weights 10 grams.........................calculate the density!!!!!!!!!!!!!!!

2007-10-18 12:04:05 · 6 answers · asked by Anon E. Mous 3 in Engineering

2007-10-18 12:02:54 · 12 answers · asked by Taylor 2 in Weather

2007-10-18 12:02:29 · 10 answers · asked by Anonymous in Mathematics

Give the order of decreasing bond strength of the following. List the bond strengths from left to right, starting with the strongest and ending with the weakest

a) CN+

b) CN

c) CN-

2007-10-18 12:02:00 · 2 answers · asked by ggmal8 2 in Chemistry

What do you think will happen when you die?

2007-10-18 12:00:53 · 10 answers · asked by Matt 2 in Astronomy & Space

I have to do a report on it, and all the sites I've searched don't have much, just a couple paragraphs. Can someone give me some reliable info WITH A GOOD SOURCE! (i.e.: not wikipedia) Sources are required for best answer.

2007-10-18 12:00:45 · 2 answers · asked by pito16places 3 in Earth Sciences & Geology

If so, why? Also why can't you use transistors with a high beta? Will it cause distortion?

2007-10-18 12:00:40 · 2 answers · asked by Anonymous in Engineering

...even though i already no it i just want 2 c if u can figure it out................a cube has 2cm lenghth,4cm wide.0.5 cm height,and it weights 10 grams calculate the density!!!!!!!!

2007-10-18 12:00:35 · 8 answers · asked by Anon E. Mous 3 in Physics

Like an element has a 2+ charge, it cant transfer to something like NO. Only 2- can transfer?

This correct?

2007-10-18 11:59:13 · 1 answers · asked by Anonymous in Chemistry

2007-10-18 11:59:11 · 3 answers · asked by cece 1 in Earth Sciences & Geology

The altitude of a triangle is increasing at a rate of 1.5 cm/min while the area of the triangle is increasing at a rate of 5 square cen/min. At what rate is the base of the triangle changing when the altitude is 9 cen and the area is 81 square cen?

2007-10-18 11:58:17 · 3 answers · asked by Lauren 1 in Mathematics

cable attached to its ends?

2007-10-18 11:57:10 · 1 answers · asked by Katherine L 1 in Physics

why does calcium carbide = Ca2C


I thought ca has a 2+ charge which would go to the C and would be CaCl2

Can someone explain when those superscripts transfer, is it betweeen non metals , or just metals

2007-10-18 11:54:37 · 3 answers · asked by Anonymous in Chemistry

What is the Noble Gas configuration for Holmium(Ho)?

I got it to be [Xe] 6s2 5d10 4f10 6p1.

Is that correct?

2007-10-18 11:53:03 · 1 answers · asked by Anonymous in Chemistry

im suppose to explain why this limit is true or false and to give an example that disproves it, if it is false.. please help!

lim
x->0 |x| / x = 1

2007-10-18 11:51:28 · 2 answers · asked by Anonymous in Mathematics

I have a square pulse that I need to convert into a stable high. Preferably I would like it to be high until I send another pulse to reset. Is there a single IC that will do this?

2007-10-18 11:51:14 · 4 answers · asked by applemartini73 1 in Engineering