Science & Mathematics - 28 September 2007

2x -7y = -10
3x +2y= 10

2007-09-28 02:58:44 · 3 answers · asked by nickmydog 1 in Mathematics

4x + y = -5
4x +3y =9

2007-09-28 02:57:46 · 5 answers · asked by nickmydog 1 in Mathematics

2007-09-28 02:56:15 · 10 answers · asked by Anonymous in Mathematics

2007-09-28 02:54:25 · 6 answers · asked by Anonymous in Mathematics

2007-09-28 02:51:59 · 5 answers · asked by Anonymous in Engineering

2007-09-28 02:50:03 · 4 answers · asked by Anonymous in Geography

2007-09-28 02:49:14 · 11 answers · asked by feelen stupid 1 in Geography

2007-09-28 02:42:03 · 12 answers · asked by Autumn 2 in Astronomy & Space

I cut a small lemon in half, squeeze both halves into my glass of water, then i throw both halves into the water. 1 half floats while the other half sinks to the bottom. Why???

2007-09-28 02:36:09 · 4 answers · asked by Anonymous in Other - Science

2007-09-28 02:32:15 · 2 answers · asked by Anonymous in Mathematics

Which of the following are orthogonal pairs a) 3i+2j
> b) i+j c) 2i-3j d) 7i+j

2007-09-28 02:30:32 · 1 answers · asked by shubra s 1 in Mathematics

2007-09-28 02:21:37 · 2 answers · asked by astronomy dummy 1 in Astronomy & Space

2007-09-28 02:18:27 · 4 answers · asked by . 1 in Mathematics

there are four odd consecutive integers. if the first term added to twice the quanity of the sum of the third and fourth term is equal to the second term squared minus three, find these numbers.

2007-09-28 02:17:51 · 2 answers · asked by Axis Flip 3 in Mathematics

Angle A= a. -4/-2 B=-2/2 C=4/-1
Can you please show your work? I don't know how to do this!

2007-09-28 02:16:56 · 1 answers · asked by Kathryn 4 in Mathematics

If 230 volts is the r.m.s value, then 325.27 volts is the peak value and 207.07 volts is the average value for half the sine wave. So if 207.07 volts is the average value, how come 230 volts is the value that is equivalent to a d.c. voltage. I understand the maths when using the r.m.s voltage with r.m.s current to find the power, but I can't understand why the r.m.s voltage (or current) alone is equivalent to d.c and not the average of half a sine wave.

2007-09-28 02:15:48 · 5 answers · asked by eazylee369 4 in Physics

2007-09-28 02:08:19 · 4 answers · asked by . 1 in Mathematics

2007-09-28 02:06:30 · 6 answers · asked by . 1 in Mathematics

can u tell me what are the three plots points for each equation than tell me were it intercect?

2007-09-28 01:59:26 · 1 answers · asked by Anonymous in Mathematics

why or why not?

2007-09-28 01:55:25 · 5 answers · asked by Nevia 1 in Mathematics

the question i guess is pretty easy, and i think i know the answer i just want to be sure....

f(x)= I x I if x =/= (doesn't equal) 0
1 if x = 0

find (lim) f(x)
x>1

2007-09-28 01:49:27 · 2 answers · asked by f4b_4 1 in Mathematics

I need help answering this question...I need to show all work. Also, step by step would be appreciated, so I can follow what was being done at each step and easch calculation...thank you!

Thermal neutrons travel at an average velocity of 2200 m/s. Perform a calculation to determine if such neutrons are relativistic.

2007-09-28 01:39:13 · 2 answers · asked by j2dabizo 1 in Mathematics

Ive been stuck on this for a day could someone PLEASE help?? PLEASE SHOW WORKING SO I CAN UNDERSTAND!!!

The function 'g' is defined by :

g : x ----> 4/(1+x^2)

a) Give a suitable domain for 'x' so that 'g' is a one-to-one function and state the range of 'g' for this domain.

b) Define an inverse function g^-1 stating its domain and the corresponding range.

2007-09-28 01:28:39 · 1 answers · asked by Anonymous in Mathematics

I'm an electrician and when at work we always use I=P/V to find the current in a curcuit. However we use V=230 volts. Since 230 is an r.m.s value would the value of I obtained also be an r.m.s value, if so shouldn't we then find the average value of current for a more accurate reading.

2007-09-28 01:25:53 · 9 answers · asked by eazylee369 4 in Physics

while the sun rises at the east why?

2007-09-28 01:19:24 · 2 answers · asked by mayhssbn 3 in Weather

omnivore,carnivore or herbivore?

2007-09-28 00:50:47 · 4 answers · asked by Hold_your_color 2 in Biology

3=4? solve mathematically

2007-09-28 00:45:26 · 12 answers · asked by Anonymous in Mathematics

I wholeheartedly do.
For me it's just a case of mathematics, with all the gazillions of stars out there, how can ours possibly be the only place where there is life.
Wel, what do YOU think?

2007-09-28 00:42:15 · 31 answers · asked by Flash 2 in Astronomy & Space

A m=2g ball is suspended by a 1 = 20 cm long string, in a constant electric field of E=1000 N/C. If the string makes an angle of 0 = 15 degrees with respect to the vertical, what is the net charge on the ball?

Please show work

2007-09-28 00:39:17 · 1 answers · asked by master 1 in Physics

I do not have a clue where to begin on solving this and any help that you could give me would be great.
Thanks

2007-09-28 00:35:54 · 12 answers · asked by Anonymous in Mathematics